Using Older AJAX Controls in Visual Studio 2008 ...

I continually received an error message stating "The control with ID TestGrid requires a ScriptManager on the page. The ScriptManager must appear before any controls that need it." However, it did have a ScriptManager before the TestGrid control. I bounced it off the Microsoft ASP.NET team and, like always, they provided me with an answer. Mike Harder said that if the assembly was compiled against the earlier version, I needed to redirect the binding at runtime using this:
           <runtime>
  <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
    <dependentAssembly>
      <assemblyIdentity name="System.Web.Extensions" publicKeyToken="31bf3856ad364e35"/>
      <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/>    </dependentAssembly>
    <dependentAssembly>      <assemblyIdentity name="System.Web.Extensions.Design" publicKeyToken="31bf3856ad364e35"/>
      <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/>    </dependentAssembly>
  </assemblyBinding>
</runtime>

This new section in the web.config is provided by default on all new 3.5 projects in Visual Studio 2008. Thanks Mike for your help!
source: weblogs

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