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Asked: 2026-06-11T22:41:57+00:00

With VS2010 I have started a fresh Azure project with one MVC2 webrole that

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With VS2010 I have started a fresh Azure project with one MVC2 webrole that has only one Asp.Net webform.

Problem

I’m running into a problem that my ReportViewer keeps loading and I can’t get it working properly with version 10.0? Version 9.0 is working like a charm, but I can’t find the differences between these two.

Internet Explorer keeps blinking, but with Chrome’s ‘inspector’ I can see that the following error occurs:

<h2>
Report Viewer Configuration Error
</h2><p>The Report Viewer Web Control HTTP Handler has not been registered in the application&#39;s web.config file. Add &lt;add verb=&quot;*&quot; path=&quot;Reserved.ReportViewerWebControl.axd&quot; type = &quot;Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a&quot; /&gt; to the system.web/httpHandlers section of the web.config file, or add &lt;add name=&quot;ReportViewerWebControlHandler&quot; preCondition=&quot;integratedMode&quot; verb=&quot;*&quot; path=&quot;Reserved.ReportViewerWebControl.axd&quot; type=&quot;Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a&quot; /&gt; to the system.webServer/handlers section for Internet Information Services 7 or later.</p>

What I did so far

I drag and drop (as adviced on multiple sites) just one ScriptManager and ReportViewer.

The project references are created automatically and the web.config’s assemblies looks OK.

    <add assembly="Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
    <add assembly="Microsoft.ReportViewer.Common, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />

The next step I do is add the handler to the web.config:

<system.web>
   <httpHandlers>
      <add path="Reserved.ReportViewerWebControl.axd" verb="*" 
      type="Microsoft.Reporting.WebForms.HttpHandler, 
      Microsoft.ReportViewer.WebForms, Version=10.0.0.0, 
      Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" validate="false" 
      />
   </httpHandlers>
</system.web>

<system.webServer>
  <validation validateIntegratedModeConfiguration="false" />
  <modules runAllManagedModulesForAllRequests="true" />

  <!-- added handler for reporting -->
  <handlers>
    <add name="ReportViewerWebControlHandler" preCondition="integratedMode" verb="*" path="Reserved.ReportViewerWebControl.axd" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
  </handlers>
</system.webServer>

After that I set the reporting properties within <script runat="server"></script> so that I can debug easily.

My webform

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Report.aspx.cs" Inherits="MvcWebRole1.Reports.Report" %>

<%@ Register Assembly="Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
    Namespace="Microsoft.Reporting.WebForms" TagPrefix="rsweb" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <script runat="server">
        protected void Page_Load(object sender, EventArgs e)
        {
            ReportViewer1.ProcessingMode = ProcessingMode.Remote;
            ReportViewer1.ServerReport.ReportServerUrl = new Uri("https://XXXX.reporting.windows.net/ReportServer");
            ReportViewer1.ServerReport.ReportPath = "/MyReport.rdl";
            ReportViewer1.ServerReport.ReportServerCredentials = new Credentials();
        }

        public class Credentials : IReportServerConnection
        {
            public IEnumerable<System.Net.Cookie> Cookies { get { return null; } }
            public Uri ReportServerUrl { get { return new Uri("https://XXXX.reporting.windows.net/ReportServer"); } }
            public int Timeout { get { return 60000; } }

            public bool GetFormsCredentials(out System.Net.Cookie authCookie, out string userName, out string password, out string authority)
            {
                authCookie = null;
                userName = "MyUserName";
                password = "MyPassword";
                authority = "XXXX.reporting.windows.net";
                return true;
            }
            public System.Security.Principal.WindowsIdentity ImpersonationUser { get { return null; } }
            public System.Net.ICredentials NetworkCredentials { get { return null; } }
        }

    </script>
    <div>
        <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
        <rsweb:ReportViewer ID="ReportViewer1" runat="server">
        </rsweb:ReportViewer>
    </div>
    </form>
</body>
</html>

What’s next?

Does anyone has any idea how I can resolve this issue!?

So, so far:

  1. Reporting Version 10.0
  2. Web.config looks OK for assemblies and handlers as well
  3. I tried visual studio debugger
  4. I tried IIS Express
  5. I tried an Windows Azure project (with emulator)
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1 Answer

  1. Editorial Team

    Well, it seems that the ‘error message’ is always there, waiting to be shown!! So don’t let it fool you!

    In the end I was very close to my solution… I only needed to add one simple line (which only took me a couple of hours):

    if(!IsPostBack){
    // All my ReportViewer1 stuff goes here
}

    This page I found very useful as well: Configuring ReportViewer for Asynchronous Rendering.

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