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European ASP.NET 4.5 Hosting - UK :: How to Use ListView Control in ASP.NET 4.5

clock July 24, 2014 08:49 by author Scott

ASP.NET 4.5 offer many great feature. Previously, we have discussed about one of new feature on ASP.NET 4.5, Key HTML Editor Features in ASP.NET 4.5. In today post, we will discuss about how to use ListView Control in ASP.NET 4.5

ASP.NET ListView Control has a great features that GridView and Repeater controls had control over the markup. The ListView Control allows you to display the data in various formats including grid format, bulleted list format and in flow format.

How to Insert and Delete Data with the ListView Control

OK, let’s get started

1. Drag the ListView control from data category of the toolbox to default.aspx page and choose the datasource for the control as shown below

2. Configure ListView option from ListViewControl smart tags as shown below

Provide the template information by selecting the desired template and also it allows you to select style for control. It also allows you to enable operations such as inserting and updating.

3. Add some custom styling to the control by adding a class as shown below

            <ul id="itemPlaceholderContainer" runat="server" class="ItemStyle">
                <li runat="server" id="itemPlaceholder" />

4. Remove the Id columns from ItemTemplate as these mark-ups generated automatically when you configure the control and columns. Repeat the same for InsertItemTemplate.

5. Add the custom styles to item containers as below

  width: 800px;

.ItemStyle li
  height: 300px;
.ItemStyle li img
margin: 10px 20px 10px 0;

6. Run your application and you’ll see the result

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ASP.NET 4.5.2 Denmark Hosting - :: How to Zip a Folder with ASP.NET 4.5.2

clock July 16, 2014 11:48 by author Peter

Sometimes, we will get requirements where we need to zip the files at runtime before sending it to the client side. For example, if our ASP.NET 4.5.2 application allows users to download multiple files at a time it will be better if we can zip it as a single file and make it available in a single download instead of downloading them individually. Doing this will give performance benefits and better user experience. Today, I wanted a simple way to create a backup of my posts, without resorting to FTP.  My solution is to create a URL that allows me to download the entire posts folder as a zip archive. To do the zipping, I used DotNetZip which is available as a nuget package and has a nice clean API.

Then in the Razor view (e.g. export.cshtml), the following code can be used to create a zip archive:
@using Ionic.Zip
    Response.BufferOutput = false; // for large files
    System.Web.HttpContext c= System.Web.HttpContext.Current;
    string archiveName= String.Format("archive-{0}.zip",
    Response.ContentType = "application/zip";
    Response.AddHeader("content-disposition", <br>             "filename=" + archiveName);
    var postsFolder = Server.MapPath("~/posts");
    using (ZipFile zip = new ZipFile())
            String.Format("Archive created on {0}", DateTime.Now);

It’s very straightforward, and I have also shown adding your own custom readme.txt from a string. If you’d rather add each file manually, just provide an enumeration of files to add to zip.AddFiles.

Finally, it would probably not be a great idea to let anyone call this, so you can protect it with a simple call to IsAuthenticated:
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European ASP.NET Hosting - Germany :: How to Fix - The specified string is not in the form required for an e-mail address

clock July 10, 2014 09:08 by author Scott

Hello, in this post, I will describe short tutorial about how to solve The specified string is not in the form required for an e-mail address. I found many people find this error on forums. Here is the error message:

As you can see above, that is the error message that you might find. So, what’s the problem?

OK, the problem in this case is not from the page itself, but it comes from your web.config file. This configuration file has a < /> element that enables you to store information about the mail server and the from account. I will give you 2 examples below how it will crash your page:

    <smtp from="">
      <network host=""/>

Please see the missing @ symbol in the mail address. And other error may come from incorrect encoded angled brackets, see this:

    <smtp from="Your Name &lt;[email protected]">
      <network host=""/>

This from attributes has an opening < character (encoded as &lt;) but lacks the closing > bracket. To avoid the error, make sure the e-mail address in the from attribute has a valid syntax and uses the right angled brackets (if you use both a name and an e-mail address) like this:

    <smtp from="Your Name &lt;[email protected]&gt;">
      <network host=""/>

If you are curious why your code crashed, then you can use Reflector and take a look in the class’s constructor code:

public MailMessage()
  this.body = string.Empty;
  this.message = new Message();
  if (Logging.On)
    Logging.Associate(Logging.Web, this, this.message);
  string from = SmtpClient.MailConfiguration.Smtp.From;
  if ((from != null) && (from.Length > 0))
    this.message.From = new MailAddress(from);

Here you can see that the code uses the (internal and static) MailConfiguration property of the SmtpClient class that in turn provides access to the From name and address. This name and address value is then passed into the constructor of the MailAddress class which performs the actual validation using its private ParseValue method.

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