Could not load file or assembly Microsoft.ReportViewer.WebForms, Version=9.0.0.0 RSS

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  Sidharth Nay...

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  Could not load file or assembly Microsoft.ReportViewer.WebForms, Version=9.0.0.0

  Mar 16, 2012 02:45 PM|LINK

  Dear all,

  We had a .Net 2 (Visual Studio 2008) website which we have upgraded to .Net 4 and VS2010. This used ReportViewer to access the reporting services reports. (We have upgraded to SQL 2008 as well now.)

  I have changed my solution to use ReportViewer v10, and I can see that from the references, and I have changed all pages and web.config to point to v10 too. However when I run the deployed website I get the following error:

  Could not load file or assembly 'Microsoft.ReportViewer.WebForms, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.

  I can't understand where it's looking for the v9 assembly from. Has anyone seen this problem before on how to fix it?

  Kind regards

  Sidharth

  Snippets from web.config:

  ...
      <compilation debug="true" targetFramework="4.0">
        <assemblies>
            <add assembly="Microsoft.ReportViewer.Common, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
            <add assembly="Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
  ...
        </assemblies>
        <buildProviders>
            <add extension=".rdlc" type="Microsoft.Reporting.RdlBuildProvider, Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
        </buildProviders>
      </compilation>
  ...
  
      <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"/>
      <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"/>
          <add name="Reserved-ReportViewerWebControl-axd" path="Reserved.ReportViewerWebControl.axd" verb="*" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" resourceType="Unspecified" preCondition="integratedMode"/>
      </handlers>
  ...

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  Sidharth Nay...

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  14 Points

  5 Posts

  Re: Could not load file or assembly Microsoft.ReportViewer.WebForms, Version=9.0.0.0

  Mar 16, 2012 03:10 PM|LINK

  Found out something else - I ran process monitor and it is trying to access the following registry keys:

  HKLM\SOFTWARE\Microsoft\Fusion\PublisherPolicy\Default\v4.0_policy.9.0.Microsoft.ReportViewer.WebForms__b03f5f7f11d50a3a
  
  HKLM\SOFTWARE\Microsoft\Fusion\PublisherPolicy\Default\policy.9.0.Microsoft.ReportViewer.WebForms__b03f5f7f11d50a3a

  It gets a Name Not Found error when it does so - understandable as only report viewer 2010 redistributable is installed.

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  necro_mancer

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  Re: Could not load file or assembly Microsoft.ReportViewer.WebForms, Version=9.0.0.0

  Mar 19, 2012 06:13 AM|LINK

  hi sidhath,
  
  have you managed to solve this issue?

  Hosted ASP.NET 4.0, WCF RIA Service, Silverlight 4 and ASP.NET MVC 3.0 Service
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  Sidharth Nay...

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  14 Points

  5 Posts

  Re: Could not load file or assembly Microsoft.ReportViewer.WebForms, Version=9.0.0.0

  Mar 21, 2012 10:53 AM|LINK

  Hi,

  Yes I have managed to solve the problem. What I did was create a new web project and moved all the pages and code to the new project and then created a new web deployment project for it! No problems now.

  Kind regards

  Sidharth

  • Marked as answer by Sidharth Nayyar on Mar 21, 2012 10:53 AM