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European ASP.NET Core Hosting :: How to Measure and Report the Response Time of ASP.NET Core

clock November 8, 2018 09:57 by author Scott

Performance is a buzzword for APIs. One of the most important and measurable parameters of the API performance is the response time. In this article, we will understand how to add code to measure the response time of an API and then return the response time data to the end client.

What is the need for this?

So, let's take a moment to think why we would ever need such a feature to measure the Response time of an API. Following are some of the points that have been the inspiration for writing code to Capture response time.

  • You need to define the SLA (Service Level Agreements) for your API with your clients. The clients need to understand how much time  the API takes to respond back. The response time data over time can help us decide on an SLA for our API.
  • Management is interested in reports as to how fast or slow the application is. You need to have data to corroborate your claims. It is worth it to have reports on the performance of the application and to share it with Stakeholders.
  • The client needs to have the information of the Response time of the API so that they can track how much time is spent on the client and the Server.

You might also have encountered similar requests in your project and it is worthwhile looking at an approach to capture the response time for the API.

Where to add the code?

Let's explore a couple of approaches to capture the response time of our API focusing mostly on capturing the time spent in our API. Our objective is to calculate the time elapsed in milliseconds from the time the request is received by the core runtime to the time the response is processed and sent back from the Server.

What factors are we ignoring?

It's important to understand that this discussion doesn't include the time spent in N/W, Time spent in IIS and Application Pool Startup. If the Application Pool wasn't up and running, then the first request can affect the overall response time of the API. There is an Application Initialization Module which we can make use of but that is out of scope for this article.

First Attempt

One very naive approach to capturing the response time of an API would be to add code to every API method at the start and end and then measure the delta to calculate the response time as shown 

// GET api/values/5   
public IActionResult Get() {  
    // Start the watch   
    var watch = new Stopwatch();  
    // Your actual Business logic   
    // End the watch  
    var responseTimeForCompleteRequest = watch.ElapsedMilliseconds;  

This code should be able to calculate the time spent in an operation. But this doesn't seem to be the right approach for the following reasons.

If an API has a lot of operations, then we need to add this code to multiple places which are not good for maintainability.

This code measures the time spent in the method only, it doesn't measure the time spent on other activities like middleware, filters, Controller selection, action method selection, Model binding etc.

Second Attempt

Let's try to improve the above code by centralizing the code in one place so that it is easier to maintain. We need to execute the response time calculation code before and after a method is getting executed. If you have worked with earlier versions of Web API, you would be familiar with concepts of Filter. Filters allow you to run code before or after specific stages in the request processing pipeline.

We will implement a filter for calculating the Response time as shown below. We will create a Filter and use the OnActionExecuting to start the timer and then stop the timer in method OnActionExecuted, thus calculating the response time of the API.

public class ResponseTimeActionFilter: IActionFilter { 
    private const string ResponseTimeKey = "ResponseTimeKey"; 
    public void OnActionExecuting(ActionExecutingContext context) { 
        // Start the timer  
        context.HttpContext.Items[ResponseTimeKey] = Stopwatch.StartNew(); 
    public void OnActionExecuted(ActionExecutedContext context) { 
        Stopwatch stopwatch = (Stopwatch) context.HttpContext.Items[ResponseTimeKey]; 
        // Calculate the time elapsed  
        var timeElapsed = stopwatch.Elapsed; 

This code is not a reliable technique for calculating the response time as it doesn't address the issue of calculating the time spent in execution of middleware, controller selection, action method selection, model binding etc. The filter pipeline runs after the MVC selects the action to execute. So, it effectively doesn't instrument the time spent in the Other pipeline. 

Third Attempt

We will use the Core Middleware to Calculate the Response time of the API.

So, what is Middleware?

Basically, Middleware are software components which handle the Request/Response. Middleware is assembled into an application pipeline and serves in the incoming request. Each component does the following operations.

  • Chooses whether to pass the request to the next component in the pipeline. 
  • Can perform work before and after the next component in the pipeline is invoked.

If you have worked with HTTPModules or HTTPHandlers in ASP.NET, then you can think of Middleware as a replacement in ASP.NET Core. Some of the examples of middleware are -

  • MVC Middleware
  • Authentication
  • Static File Serving
  • Caching
  • CORS



We want to add code to start the timer once the request enters the ASP.NET Core pipeline and stop the timer once the response is processed by the Pipeline. Custom Middleware at the start of the request pipeline seems to be the best approach for getting the access to the request as early as possible and access until the last step is executed in the pipeline.

We will build a Response Time Middleware which we will add as the first Middleware to the request Pipeline so that we can start the timer as soon the request enters the core pipeline.

What to do with the Response time data?

Once we capture the response time data we can process data in the following ways.

  1. Add the Response time data to a Reporting database or an analytics solution.
  2. Write the Response time data to a log file.
  3. Pass the response time data to a message queue which can further be processed by another application for reporting and analytics.
  4. Send the Response time information to the client applications consuming our Rest API using the Response headers.
  5. There may be other useful ways of using the response time data. Please leave a comment and tell me how you process the response time data in your application.

Let's write the code

We will write the code considering the following points.

  • Calculating the response time data for the API
  • Reporting the data back to client applications by passing the data in the Response headers.

Full code snippet for the ResponseTimeMiddleware is shown below.

public class ResponseTimeMiddleware { 
    // Name of the Response Header, Custom Headers starts with "X-"
    private const string RESPONSE_HEADER_RESPONSE_TIME = "X-Response-Time-ms";
    // Handle to the next Middleware in the pipeline
    private readonly RequestDelegate _next;
    public ResponseTimeMiddleware(RequestDelegate next) {
        _next = next;
    public Task InvokeAsync(HttpContext context) {
        // Start the Timer using Stopwatch
        var watch = new Stopwatch();
        context.Response.OnStarting(() => {
            // Stop the timer information and calculate the time
            var responseTimeForCompleteRequest = watch.ElapsedMilliseconds;
            // Add the Response time information in the Response headers.
            context.Response.Headers[RESPONSE_HEADER_RESPONSE_TIME] = responseTimeForCompleteRequest.ToString();
            return Task.CompletedTask;
        // Call the next delegate/middleware in the pipeline
        return this._next(context);

Explanation of the code

The interesting part happens in the InvokeAsync method, We use Stopwatch class to start the stopwatch once the requests enter into the first middleware of the request and then stop the stopwatch once the request has been processed and the response is ready to be sent back to the client. OnStarting method provides an opportunity to write a custom code to add a delegate to be invoked just before response headers will be sent to the client.

Lastly, we add the Response time information in a Custom Header. We use the X-Response-Time-msheader as a Response Header. As a convention, the Custom Header starts with an X.


In this article, we understood how to leverage ASP.NET middleware to manage cross-cutting concerns like measuring the response time of the APIs. There are various other useful use cases of using middleware which can help to reuse code and improve the maintainability of the application.


ASP.NET 4.5 Hosting - :: How to Create a Database With Data Source Control in ASP.NET

clock March 29, 2016 21:10 by author Anthony

In this post we are going to talk about techniques for displaying data contained in the SQL Server database with ASP.NET. There are at least three ways commonly used to perform the data binding to server conrol in ASP.NET 4.5

Here are three ways:

  • Data Source Control (Declarative)
  • Code by Hand
  • Model Binding

but in this time I will explain how to create a database with the Data Source Control in ASP.NET 4.5

Web Config

Before going into the main discussion helps me informed beforehand that the connection string that is used to communicate with the database in ASP.NET contained in the configuration file "web.config". Here are the contents

file: Web.config

<?xml version="1.0"?>

<add name="learn_webConnectionString" connectionString="Data Source=SOFT-ENGINEER;Initial Catalog=learning_web;Integrated Security=True" providerName="System.Data.SqlClient" />
<compilation debug="true" targetFramework="4.5" />
<httpRuntime targetFramework="4.5" />

Database Design

The database used in this post only use one of the table is very simple with the name "Category"

Data Source Control

Data Source Control in ASP.NET 4.5 used as a link between the database with controls for displaying data. Using this approach means that we do is get the data in a declarative rather than programmatic. To be more explicit, the following is a sample code

file: default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="TryingWebForm.Default" %>

<!DOCTYPE html>

<html xmlns="">

<head runat="server">

<title>Data Source Control</title>


<form id="form1" runat="server">


<p>The Declarative Way</p>

<asp:SqlDataSource ID="sdsCategory" runat="server" ConnectionString="<%$ ConnectionStrings:trying_webConnectionString %>"

SelectCommand="SELECT [id], [name_category] FROM [Category]"/>

<asp:GridView ID="gvCategoryDeclarative" runat="server" DataSourceID="sdsCategory" />





As seen in the above code, control "SqlDataSource" requires a connection string and a query command to be executed. In magic this control will connect to the database and execute commands query and the result was thrown into "GridView" by filling property "DataSourceID" with the Id of control SqlDataSource concerned. The image below is the result ASP.NET 4.5 Hosting

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Free ASP.NET 4.5 Cloud Hosting Spain - :: Count Number of Nodes in XML File in ASP.NET 4.5

clock May 6, 2014 06:00 by author Peter

Here I will explain how to count number of records in xml file in C# using ASP.NET 4.5 Cloud Hosting Spain or how to count number of nodes in xml file in using C# and VB.NET or count number of elements in xml file in C#.

In previous articles I explained insert xml data to sql table using stored procedure, Bind xml data to dropdown/gridview in, create online poll system with percentage graphs in and many articles relating to xml, Gridview, SQL, jQuery,, C#,VB.NET. Now I will explain how to count number of records in xml file in C# using ASP.NET.

To count number of nodes from xml file we need to write the code like as shown below

XmlDocument readDoc = new XmlDocument();
int count = readDoc.SelectNodes("CommentsInformation/Comments").Count;
lblcount.InnerHtml = "Number of Records: "+ count;

If you want to see it in complete example we need to write the code like as shown below
<html xmlns="">
<form id="form1" runat="server">
<td style="width: 100px">
<td style="width: 100px">
<asp:TextBox ID="txtName" runat="server"></asp:TextBox></td>
<td style="width: 100px">
<td style="width: 100px">
<asp:TextBox ID="txtEmail" runat="server"></asp:TextBox></td>
<asp:Button ID="btnSubmit" runat="server" OnClick="btnSubmit_Click" Text="Submit" /></td>
<br />
<label id="lblcount" runat="server" />

After that add XML file to your application and give name as "Sample.xml" then add root element in xml file otherwise it will through error. Here I added CommentInformation as root element in XML file.
<?xml version="1.0" encoding="utf-8"?>

After that add this namespace in codebehind

C# Code
using System;
using System.Xml;

After that add below code in code behind

protected void Page_Load(object sender, EventArgs e)
protected void btnSubmit_Click(object sender, EventArgs e)
XmlDocument xmldoc = new XmlDocument();
XmlElement parentelement = xmldoc.CreateElement("Comments");
XmlElement name = xmldoc.CreateElement("Name");
name.InnerText = txtName.Text;
XmlElement email = xmldoc.CreateElement("Email");
email.InnerText = txtEmail.Text;

XmlDocument readDoc = new XmlDocument();
int count = readDoc.SelectNodes("CommentsInformation/Comments").Count;
lblcount.InnerHtml = "Number of Records: "+ count;

Imports System.Xml
Partial Class vbcode
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
End Sub
Protected Sub btnSubmit_Click(ByVal sender As Object, ByVal e As EventArgs)
Dim xmldoc As New XmlDocument()
Dim parentelement As XmlElement = xmldoc.CreateElement("Comments")
Dim name As XmlElement = xmldoc.CreateElement("Name")
name.InnerText = txtName.Text
Dim email As XmlElement = xmldoc.CreateElement("Email")
email.InnerText = txtEmail.Text
Dim readDoc As New XmlDocument()
Dim count As Integer = readDoc.SelectNodes("CommentsInformation/Comments").Count
lblcount.InnerHtml = "Number of Records: " & count
End Sub
End Class

Free ASP.NET 4.5 Hosting Spain - :: ASP.NET Validation Controls.

clock April 29, 2014 09:01 by author Peter

Today I will discuss about the various validation control that ASP.NET Hosting provide and benefit of using it over client side validation. ASP.NET validation control provide two ways validation. i.e. both Server side and Client side. They perform client-side validation if after confirming that browser allows client side validation(i.e JavaScript is enabled), thereby reducing the overhead of round trip. If client side validation is disabled, it will perform the server side validation. All this from detection to validation is all taken care by the ASP.NET.

In total ASP.NET provide 5 + 1(ValidationSummary) validation control:

  1. RequiredFieldValidator 
  2. CompareValidator
  3. CustomValidator
  4. RangeValidator
  5. RegularExpressionValidator 
  6. ValidationSummary Control      

will discuss about all the control in detail, but before that i will elaborate the attributes that are common to all the controls. 

1. Display - This attribute is used to display the error message. It takes 3 options

  • None: This will ensure that no error message is displayed. Used when Validation summary is used.
  • Static: This will ensure that space on the  page is reserved even if validation pass. i.e. Real estate area on the page will be allocated.
  • Dynamic: This will ensure that space for error message is reserved only if validation fails.

In short static and dynamic do exactly the same thing. Difference between them is that in case of static Style for the <span> is

style="visibility: hidden; color: red;"

and in case of Dynamic Style for span is

style="display: none; color: red;"

2. ControlToValidate - This attribute is used to get the control on which validation is to applied
3. EnableClientScript - Boolean value to indicate whether client- side validation is enabled or not. Default value is true.
4. IsValid - Boolean value to indicate whether the control mention is ControlToValidate attribute is valid or not. Default value is true.
5. Enabled - Boolean valued to indicate if Validation control is enabled or not. Default value is true.
6. ErrorMessage - This is the text message that will be displayed in the validation summary.

RequiredFieldValidator Control
As the name suggest, this validation control make sure that control mention in ControlToValidate cannot be empty.
<asp:TextBox ID="txtSampleTextBox" runat="server">
<asp:RequiredFieldValidator ID="reqfldValidator" runat="server" ControlToValidate="txtSampleTextBox" 
Enabled="true" Display="Dynamic" ErrorMessage="Required" ToolTip="Required">

CompareValidator Control
This Control is used to compare the value or one control to the value of another control or to a fixed value. One catch here is that validation pass if both the fields are empty. To handle that one require to apply Required field validator along with CompareValidator.
<asp:TextBox ID="TextBox1" runat="server" />
<asp:TextBox ID="txtTextBox2" runat="server" />
<asp:CompareValidator ID="CompareValidator1" runat="server" ControlToValidate="txtTextBox1" ControlToCompare="txtTextBox2" Display="Dynamic" ValidationGroup="MyGroup" ToolTip="No Match">*</asp:CompareValidator>

ControlToCompare - This take the Id of control with which comparison is being done.
Comparison can be made on following data types: Currency, Date, Double, Integer and String

As the name suggest this control is used to make sure that data entered by the user fall within the specified range. Again as for Compare validator validation will pass if input control is empty. Use RequiredFieldValidator to fix this issue.
<asp:TextBox ID="TextBox1" runat="server" ValidationGroup="MyGroup" />
<asp:RangeValidator ID="RangeValidator1" runat="server" ControlToValidate="txtTextBox1" MaximumValue="800"
MinimumValue="5" ValidationGroup="MyGroup" Display="Dynamic" Type="String" ToolTip="Error">*</asp:RangeValidator>

A little explanation for this validator. It has a Type attribute that signifies the datatype for Range. In above example datatype is string with MinimumValue="5" and MaximumValue="100". The validation goes like it will accept all the value that satisfy the regex ^[5-8]+$. A little confusing but will get clear after 2 3 reading.

This is one of my favorite validator control. This control provide maximum level of flexibility to the developer and almost all the validator control function can be achieved using this validator control. RegularExpressionValidator control has attribute ValidationExpression that is used to specify the regular expression that is used to validate the input control.

<asp:TextBox ID="TextBox1" runat="server" ValidationGroup="MyGroup" />
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server"  

ValidationGroup="MyGroup" Display="Dynamic" ValidationExpression="^[5-8]+$" ToolTip="Error">*</asp:RegularExpressionValidator>

CustomValidator Control: Custom validator control is used to capture the validation that cannot be handled by the validator controls provided by ASP.NET. Here user is at the freedom to define his own custom method, both Client side and Server side. 
<asp:TextBox ID="TextBox1" runat="server" ValidationGroup="MyGroup" />
<asp:CustomValidator runat="server" ClientValidationFunction="YouClientValidationFunction" ControlToValidate="txtTextBox1" ID="cstmValidatorControl" OnServerValidate="ServerSideMethod" ValidateEmptyText="true" ToolTip="Error">*</asp:CustomValidator>

ValidateEmptyText  is a boolean attribute that if set to true, the input control will be validated even if it is empty.
ClientValidationFunction contains name of client validation function.
OnServerValidate contains name of server validation function.

ValidationSummary Control
This control is used to display the list of all the validation error that has occurred on the page. The error message displayed is the one set for the ErrorMessage attribute of the validation control. No error message will be displayed if this attribute is not set.  
<asp:TextBox ID="TextBox1" runat="server" ValidationGroup="MyGroup" />
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="txtTextBox1" ValidationGroup="MyGroup" Display="Dynamic" ValidationExpression="^[5-8]+$" ErrorMessage="Error" ToolTip="Error">*</asp:RegularExpressionValidator>

<asp:Button runat="server" ID="Button1" ValidationGroup="MyGroup" Text="Submit" />
<asp:ValidationSummary runat="server" ID="ValidationSummary1" ShowMessageBox="true" ValidationGroup="MyGroup" ShowSummary="true" DisplayMode="BulletList" />

DisplayMode has three options List, BulletList and SingleParagraph
ShowMessageBox when set to true will display the error as a alert popup
ShowSummary will display the error on the page. By default it is true.

Free Italy ASP.NET 4.5 Hosting - :: Programmatically Clearing The ASP.NET Cache For Web Forms and MVC Pages

clock April 16, 2014 06:01 by author Peter

Page level caching for ASP.NET 4.5 web forms and MVC websites is pretty awesome, because it allows you to implement something that's quite complex; multilevel caching, without having to really understand too much about caching, or even write much code. But what if you want to clear a cached page before it's due to expire.

What page caching aims to achieve

When developers turn to caching pages in their websites, usually it's because of one thing; the need for speed. When our code bases start to require continual requests to a data store, be it disk or database, that doesn't change too much overtime, caching is usually the first hammer we turn to to minimise fetching from slower stores. ASP.NET Web Forms and ASP.Net MVC both make this a pretty trivial thing to do by hiding the complexity of cache providers behind simple attributes to either your .aspx pages or controller actions:

WebForms page output caching example:

<%@ OutputCache Duration="300" VaryByParam="productId" %> MVC controller caching:
[OutputCache(Duration = 300, VaryByParam = "prodId")]
public ActionResult ProductDetails(string prodId)


The above is awesome because it's simplicity, but you'll notice one key thing here: I've set my cache expiry to 300 seconds. This is primarily because I want the content to pull from the source now and then just in case something has changed. I've used 300 seconds, but really the time may be inconsequential – I've just set it to an arbitrary number that I deemed would meet my needs.

This doesn't really use the cache as well as it could be used in many scenarios, the primary one being during a period where my site isn't being updated, and the content only changes once every few days/weeks/months. The .NET tooling attempts to allow for these situations by having support for providers like the SQLCacheDependency you can add to your application. But the SQL cache provider or even a CustomCacheProvider don't give you the fine grain control you really want: being able to programmatically remove page, control, action or child-action level cached pages. Like most great things: simple and elegant does support this out of the box – you just don't hear about it much. You can tell the runtime to remove cached pages and controls simply by using a very simple recursive API that refers to it's relative URL.

// remove any webforms cached item with the wildcard default.aspx*
// just remove the webforms product page with the prodId=1234 param
// remove my MVC controller action's output
HttpResponse.RemoveOutputCacheItem(Url.Action("details", "product", new { id = 1234 }));

You'll notice for the MVC page's cache reference I used the Url.Action helper, and I recommend this, as it uses the same MVC routing as the cache provider – usually taking the first route found. Using the Url.Action helper means your provided Url follows the same path in reverse to that of the cache provider. For MVC child actions there is currently no way that I know of clearing individual control's caches. MVC controller child actions are stored in the ChildActionCache. To clear the entire child action cache you can do the following:

OutputCacheAttribute.ChildActionCache = new MemoryCache("NewRandomStringNameToClearTheCache");

Obviously this is a pretty aggressive approach, but if you would like to do this in a more granular fashion, try the open source project MVC Doughnut caching instead. Proudly Announces Microsoft SQL Server 2014 Hosting

clock April 7, 2014 09:58 by author Peter was established to cater to an under served market in the hosting industry; web hosting for customers who want excellent service. a worldwide provider of hosting has announced the latest release of Microsoft's widely-used SQL relational database management system SQL Server Server 2014. You can take advantage of the powerful SQL Server Server 2014 technology in all Windows Shared Hosting, Windows Reseller Hosting and Windows Cloud Hosting Packages! In addition, SQL Server 2014 Hosting provides customers to build mission-critical applications and Big Data solutions using high-performance, in-memory technology across OLTP, data warehousing, business intelligence and analytics workloads without having to buy expensive add-ons or high-end appliances. 

SQL Server 2014 accelerates reliable, mission critical applications with a new in-memory OLTP engine that can deliver on average 10x, and up to 30x transactional performance gains. For Data Warehousing, the new updatable in-memory column store can query 100x faster than legacy solutions. The first new option is Microsoft SQL Server 2014 Hosting, which is available to customers from today. With the public release just last week of Microsoft’s latest version of their premier database product, HostForLIFE has been quick to respond with updated their shared server configurations.For more information about this new product, please visit

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FREE ASP.NET 4.5 Spain Hosting – :: GridView and Export to Excel

clock March 29, 2014 18:18 by author Peter

This is very simple to implement in ASP.NET 4.5 Hosting. But, there are possibilities to get problems in exporting to excel from grid view. When you bind data to gridview and write some logic to export to excel then it will not be enough. We have to check or write some additional logic which will help us to solve the problems. Below is the explanation for all problems we may get in the complete process along with detailed solution. You may encounter below errors when you try to implement the export to excel for gridview.

Control of type "GridView" must be placed inside of the form tag with runat="server"
This is very well known error to ASP.NET developers and by seeing it, we think that the control is not inside the form with runat server. But this is not correct. This error will come even if we put the GridView inside form with runat server. The reason is, in the export to excel logic we are calling RenderControl() method of GridView. So, to render it without any issues we have to override the "VerifyRenderingInServerForm" in our code.  Below is the syntax of the event. Add this to the c# code in code behind file. Remember this event is a Page event means this method you should place in ASPX page. If you are using user control to implement this export to excel logic then below are the ways to go.

1. If your user control is using by less than 3-4 pages then go to each and every page and add this event to the page.

2. If your user control is using by more than 5 pages then the best solution is to create a base page [Which inherits from System.Web.UI.Page class] and all your ASPX pages should inherit from this base page.public override void VerifyRenderingInServerForm(Control control)  

    //Confirms that an HtmlForm control is rendered for the specified ASP.NET   
    //server control at run time. 

Now, after we added the event to page, the error will go away for sure. Even when you add the above code/event to the page, this is not enough if you have the paging, sorting enabled on gridview. If you enable paging or sorting then you encounter the below error.

"RegisterForEventValidation can only be called during Render();"

This error is coming because we are doing paging and sorting. If no paging or sorting enabled this error will not come. To resolve this error, please follow below steps.

1. In your export to excel button click event, first disable the paging, sorting on gridview and do data bind.
2. Call export to excel logic.
3. Re-enable paging, sorting on gridview and databind.

Below is the logic we have to use in export to excel button click event.

gvReport.AllowPaging = false;  
    gvReport.AllowSorting = false;  
    ExportToExcel();//Method to use export to excel.  
    gvReport.AllowPaging = true;  
    gvReport.AllowSorting = false;  

Now, you are clear with all errors and the logic will export all data in gridview to excel.

FYI, I am placing a sample of ExportToExcel() functionality here.

private void ExportToExcel()  
        Response.AddHeader("content-disposition", string.Format("attachment;filename=excel_report.xls"));  
        Response.Charset = ""; 
        // Response.Cache.SetCacheability(HttpCacheability.NoCache);  
        Response.ContentType = "application/vnd.xls";  
        System.IO.StringWriter stringWrite = new System.IO.StringWriter();  
        System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);  

Note: gvReport is the gridview control name in my example. And there are lot of posts in internet guide you incorrect to resolve the above error. For example, they will say set EnableEventValidation="false" in the <%@ Page directive Or disable validation in web.config level to resolve the error. Please do not set it.

FREE ASP.NET 4.5 Hosting UK - :: How can Guarantee Our Windows ASP.NET 4.5 Hosting Service?

clock March 24, 2014 07:05 by author Scott

Only focusing on ASP.NET hosting service, HostForLIFE prove ourselves to be one of the best ASP.NET hosting providers that offer the most highlights, although there are thousands of ASP.NET hosting companies on the market. In below, we have listed our main features that has integrated with our 4 ASP.NET hosting plans.

Offering Many Excellent Features

- 1-Click Application Installer

In the HostForLIFE control panel, there is a 1-click web application installer for convenient installation of many popular open source web applications, including PHP apps like WordPress, Joomla, Drupal and phpBB, and ASP.NET applications like DotNetNuke, nopCommerce, BlogEngine and Orchard.


In the past, PHP didn't run well on a Windows server, but over the last several years, Microsoft has improved IIS and now PHP runs vey well on Windows hosting platforms, which means famous open source apps like Joomla, WordPress and Drupal can run well on HostForLIFE Windows hosting plans.

In addition, by supporting MySQL as part of their Windows hosting platform, a popular open source relational database system, HostForLIFE enables customers to use a lot of popular open source apps.

- ASP.NET 4.5.1 Hosting

We support ASP.NET 4.5.1 hosting on our Windows 2012 platform, which is compatible with Visual Studio 2013/2012, and our Windows 2008 hosting platform also fully supports ASP.NET 4.0 and is compatible with Visual Studio 2010, which enables customers' applications to be written in any language that is compatible with the common language runtime, including Visual Basic and C#.

- SQL Server

HostForLIFE always improve our technology and we always up to date with the Micorosoft technology. We offer the latest SQL 2012 version. We also support integrated full text search, stored procedures and ASP.NET SQL Session, which makes their customers get DBO right and manage SQL database remotely using SQL Management Studio or SQL Management Studio Express.

- Windows 2012 Hosting

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ASP.NET Hosting - Belgium - :: Basic Authentication with ASP.NET Web API Using Authentication Filter

clock March 10, 2014 07:42 by author Peter

Authorization filters and action filters have been around for a while in ASP.NET Web API but there is this new authentication filter introduced in Web API 2. Authentication filters have their own place in the ASP.NET Web API pipeline like other filters. Historically, authorization filters have been used to implement authentication and there is ton of samples out there with all kinds of authentication implemented in authorization filters. Web API 2 introduces the authentication filter so that authentication concerns can be separated out of authorization filter and put into an authentication filter.

This blog post is just a quick introduction to writing a custom authentication filter for implementing HTTP Basic Authentication. There is a full-blown example here, if you are interested in writing a production-strength filter.First up, we create the filter class BasicAuthenticator implementing the IAuthenticationFilter interface. We also derive from Attribute so that we can apply the filter on action methods, like so.

public class EmployeesController : ApiController
    [BasicAuthenticator(realm: "Magical")]
    public HttpResponseMessage Get(int id)
        return Request.CreateResponse<Employee>(
        new Employee()
            Id = id,
            FirstName = "Johnny",
            LastName = "Law"

There are two interesting methods that we need to implement in the filter – (1) AuthenticateAsync and (2) ChallengeAsync.

AuthenticateAsync contains the core authentication logic. If authentication is successful, context.Prinicipal is set. Otherwise, context.ErrorResult is set to UnauthorizedResult, which basically gets translated to a “401 – Unauthorized” HTTP response status code.

public class BasicAuthenticator : Attribute, IAuthenticationFilter
    private readonly string realm;
    public bool AllowMultiple { get { return false; } }
    public BasicAuthenticator(string realm)
        this.realm = "realm=" + realm;
    public Task AuthenticateAsync(HttpAuthenticationContext context,
                                  CancellationToken cancellationToken)
        var req = context.Request;
        if (req.Headers.Authorization != null &&
                          "basic", StringComparison.OrdinalIgnoreCase))
            Encoding encoding = Encoding.GetEncoding("iso-8859-1");
            string credentials = encoding.GetString(
            string[] parts = credentials.Split(':');
            string userId = parts[0].Trim();
            string password = parts[1].Trim();
            if (userId.Equals(password)) // Just a dumb check
                var claims = new List<Claim>()
                    new Claim(ClaimTypes.Name, "badri")
                var id = new ClaimsIdentity(claims, "Basic");
                var principal = new ClaimsPrincipal(new[] { id });
                context.Principal = principal;
            context.ErrorResult = new UnauthorizedResult(
                     new AuthenticationHeaderValue[0],
        return Task.FromResult(0);
    public Task ChallengeAsync(
                     HttpAuthenticationChallengeContext context,
                            CancellationToken cancellationToken) {}

For basic authentication, when there is a 401, we are supposed to send WWW-Authenticate header and the right place to write such challenge related logic will be the ChallengeAsync method. This is where things get interesting because it is not so straight forward to add headers here. The recommended approach is to create a class implementing IHttpActionResult and set an instance of it to context.Result, like so.

public Task ChallengeAsync(HttpAuthenticationChallengeContext context,
                                      CancellationToken cancellationToken)
    context.Result = new ResultWithChallenge(context.Result, realm);
    return Task.FromResult(0);

Here is the result class. The crux of this class is in the ExecuteAsync method and that is where we set the WWW-Authenticate response header indicating the scheme and the realm.

public class ResultWithChallenge : IHttpActionResult
    private readonly IHttpActionResult next;
    private readonly string realm;
    public ResultWithChallenge(IHttpActionResult next, string realm)
    { = next;
        this.realm = realm;
    public async Task<HttpResponseMessage> ExecuteAsync(
                                CancellationToken cancellationToken)
        var res = await next.ExecuteAsync(cancellationToken);
        if (res.StatusCode == HttpStatusCode.Unauthorized)
               new AuthenticationHeaderValue("Basic", this.realm));
        return res;

For setting the WWW-Authenticate response header, we created a class. However, it is possible to get away without creating one, like this.

public Task ChallengeAsync(HttpAuthenticationChallengeContext context,
                               CancellationToken cancellationToken)
    var result = await context.Result.ExecuteAsync(cancellationToken);
    if (result.StatusCode == HttpStatusCode.Unauthorized)
                new AuthenticationHeaderValue(
                    "Basic", "realm=" + this.realm));
    context.Result = new ResponseMessageResult(result);

However, this approach will not work with MVC since there is no ResponseMessageResult. For the sake of consistency, it is better to create our own class. Also, the code above changes the pipeline behavior slightly. For these reasons, it is recommended to create a class implementing IAuthenticationFilter (the initial approach in this post).

ASP.NET 4 European Hosting - :: Tips to Improve ASP.NET Application Performance

clock February 4, 2014 06:35 by author Peter

Web application is designed to handle hundreds and thousands of requests per seconds so to handle these requests effectively and successfully it is important to resolve any potential performance bottlenecks. Now we will state some tips that improve the performance of your web application. Try, only with € 3.00/month, you can get a reasonable price with best service. This topic contains only brief information about ASP.NET, if you want to be more familiar with ASP.NET, you should try

1. Cache Commonly used objects
You can cache commonly used objects in ASP.Net using Cache class that provides an extensive caching mechanism that storing resources and allow you to:

- Define an expiration for a cached object either by specified a TimeSpan or a fixed DateTime.

- Define priority for cached objects. when there is a memory lack and objects need to be freed.

- Define validity for a cached object by adding dependacies

- Attach callbacks to cached objects,so when an objects is removed from cache the callback is invoked.

you can add objects to cache by adding it to cache Dictionary.

Cache["Mykey"] = myObject;

or using Insert method of Cache class

Cache.Insert("MyKey",myObject, Cache.NoAbsoluteExpiration, TimeSpan.FromMinutes(60), dependacies : null );

2. Using Asynchronous Pages,Modules and Controllers
When IIS passes a request to ASP.NET, the request is queued to the thread pool and a worker thread is assigned to handle this request. the worker thread is limited so any new request will be queued to be handle after the current requests handled. If a request need to do some I/O operation like retrieving data from  a database or calling web service that mean you need to reduce the request time.

You can change I/O operation in your web page by making it as Asynchronous Page. In ASP.NET you can do that by firstly marking the page as async

<%@ Page Async="true"....

then create new PageAsyncTask object and pass it the delegates for the begin, end, and timeout methods. After creating PageAsyncTask object, call the Page.RegisterAsuncTask method to start the asynchronous opertaion.

public partial class MyAsyncPage : System.Web.UI.Page
   private SqlConnection _sqlConnection;
   private SqlCommand _sqlCommand;
   private SqlDataReader _sqlReader;

   IAsyncResult BeginAsyncOp(Object sender, EventArgs e, AsyncCallback cb, Object state)
       // this method will be executed in the original worker thread,
       //so don't do any lengthy operation here
       _sqlcommand = CreateSqlCommand(_sqlConnection);
       return _sqlCommand.BeginExecuteReader();
   void EndAsyncOp(IAsyncResult asyncResult)
       _sqlReader = _sqlCommand.EndExecuteReader(asyncResult);
       // read the data and build page contents
   void TimeoutAsyncOp(IAsyncResult asyncResult)
       _sqlReader = _sqlCommand.EndExecuteReader(asyncResult);
       // read the data and build page contents
   public override void Dispose()
       if(_sqlConnection != null)
   protected void btnClick_Click(Object sender, EventArgs e)
       PageAsyncTask task = new PageAsyncTask( new BeginEventHandler(BeginAsyncOp),
                                               new EndEventHandler(EndAsyncOp),
                                               new TimeoutEventHandler(TimeoutAsyncOp),
                                               state : null);

There is another way to create async pages is by using completion events.

public partial class MyAsyncPage2 : System.Web.UI.Page
   protected void btnGetData_Click(Object sender , EventArgs e)
       Services.MyService serviceProxy = new Services.MyService();
       serviceProxy.GetDataCompleted +=Services.GetDataCompletedEventHandler(GetData_Completed);
   void GetData_Completed(Object sender,Services.GetDataCompletedEventArgs e)
       //Extract the result from the event args and build the page's content


In ASP.NET MVC you can create such mechanisme by creating Asynchronous Controller. To create such contoller you need to follow these four steps:

- Create a Controller class that inherits from the AsyncController type.

- Implement  a set of action methods for each async operation according to the following convention, where xx is the name of the action: xxAsync and xxCompleted.

- In the xxAsync method, call the AsyncManager.OutstandingOperations.Increment method with the number of asynchronous operations you are about to perform.

- In the code which executes during the return of the async operation, call the AsyncManager.OutstandingOperations.Decrement method to notify the operation has completed.

The following code shows you how to implement these steps:

public class MyController : AsyncController
   public void IndexAsync()
       MyService serviceProxy = new MyService();
       serviceProxy.GetDataCompleted += (sender , e) => {
                                        AsyncManager.Parameters["result"] = e.Value;
   public ActionResult IndexCompleted(MyData result)
       return view("Index",new MyViewModel { TheData = result });

3. Turn off ASP.NET Tracing and debugging
before deploying your web application turn of tracing feature by setting it to false in web.config file

        <trace enabled="false" />

While development phase you need to enable debugger to debug your code by setting it to true in web.config file. Neglecting change it again to false before deploying will affect your web application performance by facing many problems:

- Scripts that are downloaded using the WebResources.axd handler, by setting debug to false responses from that handler will be returned with caching headers, allowing browsers to cache the responses for future use.

- Request will not timeout when debug is set to true. By setting it to false will enable ASP.NET to define timeouts for requests according to the HttpRuntime.Execution Timeout configuration settings.

- JIT optimization will not be applied to the code when running with debug = true. JIT can efficiently improve the performance of your ASP.NET application without requiring you change your code.

- The compilation process does not use batch compilation when using debug = true. without batch compilation an assembly will be created for each page and control causing web application to load so many of assemblies during runtime. When debug set to false batch compilation is used, generating a single assembly for the user control and a several assemblies for pages.

in case you fear to forget setting debug to false when deploying your application, you can force all ASP.NET applications in a server to ignore the debug setting by adding  the following configurations in the server's machine.config file.

        <deployment retail="true" />

4. Disable View State
View state is used to allow ASP.NET to keep the state of the page between postbacks performed by user. View state data is stored in HTML output inside hidden field. If your page displays many controls that contains a huge data, the view state field will be big enough to affect the response time of your page. if your page just display data without need any postback so it will be better to disable the view state of the whole page by set EnableViewState to false.

<%@ Page EnableViewState="false".......%>

or disable view state of some controls in your page

<Asp:GridView ID="MyGrid" runat="server" DataSource="MyDataSource" EnableViewState="false" />

if you don't want to use view state in all pages of your web application it recommended to disable view state for whole web application by setting it to false in your web.config file

    <pages enableViewState="false" ....../>

5. Pre-Compiling ASP.NET Application
When compiling an ASP.NET application project, a single assembly is created to hold all application's code but web pages(.aspx) and user controls(.ascx) not compiled and be deployed as it is. In the first request ASP.NET dynamically compiles the web pages and user control and places the compiled files in the ASP.NET temporary files folder.
To reduce the time of first request the web application can be pre-compiled, including all code, pages, and user controls, by using the ASP.NET compilation tool (Aspnet_compiler.exe). Running this tool in production servers can reduce the delay users experience on first requests.

- Open a command prompt in your production server.

- Navigate to the %windir%\Microsoft.Net folder

- Navigate to either the Framework or Framework64 according to the configuration of web application's application pool.

- Navigate to framework version's folder.

- Enter the following command to start the compilation

Aspnet_compiler.exe  -v  /FullPathOfYourWebApplication

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