In this short article, I will tell you about How to Capture Screenshot Image of Website in ASP.NET 5. To catch the screenshot of page, I am making utilization of WebBrowser control of Windows Forms Application. Since the WebBrowser is a Windows Forms controls, so as to utilize it as a part of ASP.NET Web Projects, we will need to add reference to the accompanying libraries.

And here is the code that I used:

ASP.NET
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title> How to Capture Screenshot in ASP.NET</title>
</head>
<body>
    <form id="form1" runat="server">
    <table>
        <tr>
            <td>
                <b>Enter WebSite Url:</b>
            </td>
            <td>
                <asp:TextBox ID="txtUrl" runat="server" />
            </td>
        </tr>
        <tr>
            <td>
            </td>
            <td>
                <asp:Button ID="btnCapture" Text="Capture" runat="server" OnClick="btnCapture_click" />
            </td>
        </tr>
    </table>
    <br />
    <asp:Image ID="imgScreenshot" runat="server" Visible="false" Height="800" Width="800" />
    </form>
</body>
</html>

Code for C#
using System.IO;
using System.Drawing;
using System.Threading;
using System.Windows.Forms;
public partial class CaptureWebsite : System.Web.UI.Page
{
    protected void btnCapture_click(object sender, EventArgs e)
   {
        string url = txtUrl.Text.Trim();
        Thread thread = new Thread(delegate()
       {
            using (WebBrowser browser = new WebBrowser())
            {
                browser.ScrollBarsEnabled = false;
                browser.AllowNavigation = true;
                browser.Navigate(url);
                browser.Width = 1024;
                browser.Height = 768;
                browser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webbrowse_DocumentCompleted);
                while (browser.ReadyState != WebBrowserReadyState.Complete)
                {
                    System.Windows.Forms.Application.DoEvents();
                }
            }
        });
        thread.SetApartmentState(ApartmentState.STA);
        thread.Start();
        thread.Join();
    }
    private void webbrowse_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
    {
        WebBrowser webrowse = sender as WebBrowser;
        Bitmap bitmap = new Bitmap(webrowse.Width, webrowse.Height);
        webrowse.DrawToBitmap(bitmap, webrowse.Bounds);
        MemoryStream stream = new MemoryStream();
        bitmap.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);
        byte[] strbytes = stream.ToArray();
        imgScreenshot.Visible = true;
        imgScreenshot.ImageUrl = "data:image/jpeg;base64," + Convert.ToBase64String(strbytes);
    }
}


Code for VB.NET

Imports System.IO
Imports System.Drawing
Imports System.Threading
Imports System.Windows.Forms
Partial Public Class CaptureWebsite
    Inherits System.Web.UI.Page
    Protected Sub btnCapture_click(sender As Object, e As EventArgs)
        Dim url As String = txtUrl.Text.Trim()
                   Dim thread As New Thread(Sub() Using browser As New WebBrowser()
        browser.ScrollBarsEnabled = False
        browser.AllowNavigation = True
        browser.Navigate(url)
        browser.Width = 1024
        browser.Height = 768
        browser.DocumentCompleted += New WebBrowserDocumentCompletedEventHandler(AddressOf webbrowse_DocumentCompleted)
        While browser.ReadyState <> WebBrowserReadyState.Complete            System.Windows.Forms.Application.DoEvents()
        End While
                   End Using)
        thread.SetApartmentState(ApartmentState.STA)
        thread.Start()
        thread.Join()
    End Sub   
Private Sub webbrowse_DocumentCompleted(sender As Object, e As WebBrowserDocumentCompletedEventArgs)
        Dim webrowse As WebBrowser = TryCast(sender, WebBrowser)
        Dim bitmap As New Bitmap(webrowse.Width, webrowse.Height)
        webrowse.DrawToBitmap(bitmap, webrowse.Bounds)
        Dim stream As New MemoryStream()
        bitmap.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg)
        Dim strbytes As Byte() = stream.ToArray()
        imgScreenshot.Visible = True
        imgScreenshot.ImageUrl = "data:image/jpeg;base64," + Convert.ToBase64String(strbytes)
    End Sub
End Class

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