PRB: System.Threading.ThreadAbortException Error Message When You Use Server.Transfer in HTTPHandler in an ASP.NET Application

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SYMPTOMS

When you use a Server.Transfer method in HTTPHandler to transfer the control from one page to another in an ASP.NET Web application, you may receive the following error message:

System.Threading.ThreadAbortException: Thread was being aborted. at System.Threading.Thread.AbortInternal() at System.Threading.Thread.Abort() at System.Threading.Thread.Abort(Object stateInfo) at System.Web.HttpResponse.End() at System.Web.HttpServerUtility.Transfer(String path, Boolean preserveForm)

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CAUSE

When you call Server.Transfer, ASP.NET internally calls the Server.Execute method to transfer the control, and calls the Response.End method to end the processing of the current page. Response.End ends the page execution and calls the Thread.Abort method. The Thread.Abort method causes the ThreadAbortException error message to appear.

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WORKAROUND

To work around this problem, use Server.Execute instead of Server.Transfer in the ProcessRequest method of HTTPHandler. The modified ProcessRequest method is as follows:

Visual C# .NET Sample Code

public void ProcessRequest(HttpContext context) 
      {
         try
         {            
            context.Server.Execute("WebForm1.aspx");
         }
         catch(System.Exception e)
         {
            context.Response.Write(e.StackTrace);
            context.Response.Write(e.ToString());
         }
      }

Visual Basic .NET Sample Code

Public Sub ProcessRequest(ByVal context As HttpContext) _
       Implements IHttpHandler.ProcessRequest
      Try        
         context.Server.Execute("WebForm1.aspx")
      Catch e As Exception
         context.Response.Write(e.StackTrace)
      End Try
End Sub

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STATUS

This behavior is by design.

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MORE INFORMATION

Steps to Reproduce the Behavior

In Microsoft Visual Studio .NET, use Visual Basic .NET or Visual C# .NET to create a new ASP.NET Web Application project. By default, WebForm1.aspx is created. Name the project ServerTransferTest.
Right-click WebForm1.aspx and then click View HTML Source.

Replace the existing code with the following sample code:

<%@ Page %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
   <HEAD>
      <title>WebForm1</title>      
   </HEAD>
   <body MS_POSITIONING="GridLayout">
      <form id="Form1" method="post" runat="server">
         <asp:HyperLink id="HyperLink1" style="Z-INDEX: 101; LEFT: 324px; POSITION: absolute; TOP: 181px" runat="server" NavigateUrl="http://localhost/ServerTransferTest/test.ashx">http://localhost/ServerTransferTest/test.ashx</asp:HyperLink>
         <asp:Label id="Label1" style="Z-INDEX: 102; LEFT: 292px; POSITION: absolute; TOP: 149px" runat="server">On Clicking this URL should not throw any exception</asp:Label>
      </form>
   </body>
</HTML>

Double-click Design View of WebForm1.aspx, and then replace the exiting code in the code behind page with the following sample code:

Visual C# .NET Sample Code

using System;
using System.Web;
using System.Web.UI.WebControls;

namespace ServerTransferTest
{
	/// <summary>
	/// Summary description for WebForm1.
	/// </summary>
	public class WebForm1 : System.Web.UI.Page
   {
      protected System.Web.UI.WebControls.Label Label1;
      protected System.Web.UI.WebControls.HyperLink HyperLink1;

		private void Page_Load(object sender, System.EventArgs e)
		{
        
		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: ASP.NET Web Form Designer requires this call.
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method by using the code editor.
		/// </summary>
		  private void InitializeComponent()
		  {
  		   this.Load += new System.EventHandler(this.Page_Load);
		  }
		#endregion
	}
}

Visual Basic .NET Sample Code

Public Class WebForm1
   Inherits System.Web.UI.Page
   Protected WithEvents Label1 As System.Web.UI.WebControls.Label
   Protected WithEvents HyperLink1 As System.Web.UI.WebControls.HyperLink

#Region " Web Form Designer Generated Code "

   'Web Form Designer requires this call.
   <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()

   End Sub

   Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
      'CODEGEN: Web Form Designer requires this method call. 
      'Do not modify it by using the code editor.
      InitializeComponent()
   End Sub

#End Region

   Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
      'Put user code to initialize the page here
   End Sub

End Class

On the File menu, click Add New Item.
Under Add New Item, click Class. In the Name text box under Add New Item, rename the class HelloWorldHandler, and then click Open.

Replace the existing code in the HelloWorldHandler class file with the following sample code:

Visual C# .NET Sample Code

using System.Web;
namespace ServerTransferTest
{
   public class HelloWorldHandler : IHttpHandler 
   {
      public void ProcessRequest(HttpContext context) 
      {
         try
         {
            context.Server.Transfer("WebForm1.aspx", true ) ;            
         }
         catch(System.Exception e)
         {
            context.Response.Write(e.StackTrace);
            context.Response.Write(e.ToString());
         }
      }
      public bool IsReusable 
      {
         // To enable pooling, return true here.
         // This keeps the handler in memory.
         get { return false; }
      }
   }
}

Visual Basic .NET Sample Code

Imports System
Imports System.Web

Public Class HelloWorldHandler
   Implements IHttpHandler
   Public Sub ProcessRequest(ByVal context As HttpContext) _
       Implements IHttpHandler.ProcessRequest
      Try
         ' context.Server.Transfer("WebForm1.aspx", True)
         context.Server.Execute("WebForm1.aspx")
      Catch e As Exception
         context.Response.Write(e.StackTrace)
      End Try
   End Sub
   ' Override the IsReusable property.        
   Public ReadOnly Property IsReusable() As Boolean _
   Implements IHttpHandler.IsReusable
      Get
         Return True
      End Get
   End Property
End Class

Repeat steps 5 and 6 to add another class file. Rename the class file HelloWorldHandlerFactory.

Replace the existing code in the HelloWorldHandlerFactory class file with the following sample code:

Visual C# .NET Sample Code

using System.Web;
namespace ServerTransferTest
{
   public class HelloWorldHandlerFactory : IHttpHandlerFactory
   {
      public IHttpHandler GetHandler( HttpContext context, System.String requestType, System.String url, System.String pathTranslated)
      {
         HttpResponse Response = context.Response;
         Response.Write("<html>");
         Response.Write("<body>");
         Response.Write("<h1> Hello from HelloWorldHandlerFactory.GetHandler </h1>");
         Response.Write("</body>");
         Response.Write("</html>");
         return new HelloWorldHandler();
      }
      public void ReleaseHandler( IHttpHandler handler )
      {
      }
   }
}

Visual Basic .NET Sample Code

Imports System
Imports System.Web
Public Class HelloWorldHandlerFactory
   Implements IHttpHandlerFactory
   Public Overridable Function GetHandler(ByVal context As HttpContext, _
   ByVal requestType As String, ByVal url As String, ByVal pathTranslated As String) _
        As IHttpHandler _
        Implements IHttpHandlerFactory.GetHandler

      Dim Response As HttpResponse = context.Response
      Response.Write("<html>")
      Response.Write("<body>")
      Response.Write("<h1> Hello from HelloWorldHandlerFactory.GetHandler </h1>")
      Response.Write("</body>")
      Response.Write("</html>")
      Return New HelloWorldHandler()
   End Function

   Public Overridable Sub ReleaseHandler(ByVal handler As IHttpHandler) _
       Implements IHttpHandlerFactory.ReleaseHandler
   End Sub
End Class

Open the Web.config file, and then add the httpHandlers section in the System.Web section as follows:

<configuration> 
  <system.web>
   <httpHandlers>
     <add verb="*" path="*.ashx" type="ServerTransferTest.HelloWorldHandlerFactory,ServerTransferTest" />
   </httpHandlers>
.....
.....
</system.web>
</configuration>

On the Debug menu, click Start, and then click the following hyperlink on WebForm1.aspx:
http://localhost/ServerTransferTest/test.ashx

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REFERENCES

For additional information, click the following article numbers to view the articles in the Microsoft Knowledge Base:

312629 (http://support.microsoft.com/kb/312629/EN-US/ ) PRB: ThreadAbortException Occurs If You Use Response.End, Response.Redirect, or Server.Transfer

320439 (http://support.microsoft.com/kb/320439/EN-US/ ) PRB: "Error Executing Child Request" Error Message When You Use Server.Transfer or Server.Execute in ASP.NET Page

224363 (http://support.microsoft.com/kb/224363/EN-US/ ) Using the Server.Execute Method

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