I have tried to place a GridView inside an UpdatePanel to use in a custom section in Umbraco backoffice.

The page is showing fine, when I'm not using the UpdatePanel, but when I do it cause a "Server Error in "/" Application" error..

Should I modify something to get AJAX to work?

I'm using Umbraco 4.7 .NET 4.0 and in the web.config I have the following, which I haven't changed something in.

<runtime>
    <!-- Old asp.net ajax assembly bindings -->
    <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="4.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Extensions.Design" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="4.0.0.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>

- Bjarne