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Editorial Team
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Asked: 2026-05-12T14:15:38+00:00

I have just moved a site from a Windows 2003, IIS6 SQL 2005 server

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I have just moved a site from a Windows 2003, IIS6 SQL 2005 server to a new one with Windows 2008, IIS7 and SQL 2008.

I am having problems with the Report Viewer.
I have installed the Report Viewer Re-distributable (I’ve tried 2005, 2005sp, 2008 and 2008sp)
I’ve Mapped a handler in IIS for

Reserved.ReportViewerWebControl.axd

to type

Microsoft.Reporting.WebForms.HttpHandler,
Microsoft.ReportViewer.WebForms,
Version=8.0.0.0, Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a

However whenever I run a report on the website I get the following error message:

Could not load type ‘Microsoft.Reporting.Microsoft.Reporting.WebForms.HttpHandler’ from assembly ‘Microsoft.ReportViewer.WebForms, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.TypeLoadException: Could not load type ‘Microsoft.Reporting.Microsoft.Reporting.WebForms.HttpHandler’ from assembly ‘Microsoft.ReportViewer.WebForms, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’.

I am stumped. Any ideas?

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1 Answer

  1. Editorial Team

    I think you need to map to version 9.0.0.0 and not 8.0.0.0

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