redirect to error on exceeding fileupload size

I am trying to direct user to a error page when maximum fileupload size excedds.For this iam doing the following thing:

public void Init(HttpApplication application)
    {
        application.BeginRequest += new EventHandler(application_BeginRequest);
    }

    void application_BeginRequest(object sender, EventArgs e)
    {
        HttpApplication application = (HttpApplication)sender;
        HttpContext context = application.Context;
        if (context.Request.ContentLength > 4096000)
        {
            context.Response.Redirect("~/Error.aspx");
        }
    }
    public void Dispose()
    {
    }
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But on uploading file with size more than the max filesize it is showing "connection reset" error. How should i do this.

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Check this question: Display custom error page when file upload exceeds allowed size in ASP.NET MVC

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The ASP.NET runtime might reject the request even before your application fires up. Check the maximum request length set in a web.config - the value should be greater then the one your application is expecting:

IIS6/IIS7 (classic pipeline AND integrated pipeline):

<system.web>
  <!-- The value is in KB -->
  <httpRuntime maxRequestLength="4096" />
</system.web>

IIS7 (integrated pipeline):

<system.webServer> 
  <security> 
    <requestFiltering> 
      <!-- The value is in bytes -->
      <requestLimits maxAllowedContentLength="209715200" />
    </requestFiltering>
  </security>
</system.webServer>

Hope this will help.

-- Pavel

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Okay, you're probably getting a ThreadAbortException, that's why the connection is reset.

Please refer to this KB article for a workaround: ThreadAbortException Occurs If You Use Response.End, Response.Redirect, or Server.Transfer.

-- Pavel

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I believe that to do this correctly from the handler you will need to read all of the data off of the request before sending the response/redirect. Alternatively, you can do this from an ISAPI filter and avoid having to read the data.

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You can use toolkit AsyncFileUpload control and then catch the error in the client side and redirect to the error page.

AsyncFileUpload: How do I hide the max request length exceeded alert error?

<asp:AsyncFileUpload ID="fileUpload" 
                     runat="server" OnClientUploadError="onUploadError"
                     OnClientUploadComplete="uploadComplete"
                     OnUploadedComplete="OnUploadComplete" />

<script language="javascript" type="text/javascript">

     function onUploadError()
     {
          //Redirect to error page.
     }

     function uploadComplete()
     {

     }


 </script>

---

Use Transfer.Redirect()

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Following the post the reason can be just a redirection to local site:

It doesn't seem to work when the server is local (either through using localhost, local ip or http://machinename/). The browser just reacts like the server completely dropped the connection - connection reset by peer / connection was reset (FF) / cannot display web page (IE).