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Editorial Team
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Asked: 2026-05-15T09:34:50+00:00

I am writing an ASP.NET app that uses a SQL Server 2005 with SSRS

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I am writing an ASP.NET app that uses a SQL Server 2005 with SSRS setup. I want to use the ReportViewer control but I get an error when using ReportViewer 10 because it needs SSRS 2008.

How can I use ReportViewer 9 within my application. I’ve added a reference to the Microsoft.ReportViewer.WebForms.dll version 9 and removed the reference to version 10.

My markup is as follows:

<%@ Register Assembly="Microsoft.ReportViewer.WebForms, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
    Namespace="Microsoft.Reporting.WebForms" TagPrefix="rsweb" %>
<!-- standard markup -->
<rsweb:ReportViewer ID="ReportViewer1" runat="server"></rsweb:ReportViewer>

but when I try to run this I get the following error:

CS0433: The type
‘Microsoft.Reporting.WebForms.ReportViewer’
exists in both
‘c:\WINDOWS\assembly\GAC_MSIL\Microsoft.ReportViewer.WebForms\10.0.0.0__b03f5f7f11d50a3a\Microsoft.ReportViewer.WebForms.dll’
and
‘c:\WINDOWS\assembly\GAC_MSIL\Microsoft.ReportViewer.WebForms\9.0.0.0__b03f5f7f11d50a3a\Microsoft.ReportViewer.WebForms.dll’

What have I missed!?

Update:
When trying to use the ReportViewer 10 I get the following error:

“Remote report processing requires
Microsoft SQL Server 2008 Reporting
Services or later.”

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1 Answer

  1. Editorial Team

    Figured it out, forgot to change 3 references in the web.config file:

    within HttpHandler:

    <add verb="*" path="Reserved.ReportViewerWebControl.axd" type = "Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />

    and within assemblies:

    <add assembly="Microsoft.ReportViewer.WebForms, Version=9.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
<add assembly="Microsoft.ReportViewer.Common, Version=9.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
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