I've got a number of modules written against .NET 2.0 on our DNN 4.9.x installation. Lately, I decided to upgrade one of them to 3.5 so I could use the new Charts controls but now all of my modules using UpdatePanels with 2.0 are broken. DotNetNuke.Services.Exceptions.ModuleLoadException: c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\5badfcee\f17ac744\App_Web_basicinfo.ascx.97730825.sg8lzai6.0.cs(8127): error CS0433: The type 'System.Web.UI.UpdatePanel' exists in both 'c:\WINDOWS\assembly\GAC_MSIL\System.Web.Extensions\3.5.0.0__31bf3856ad364e35\System.Web.Extensions.dll' and 'c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\5badfcee\f17ac744\assembly\dl3\69975b21\004187ac_515cc701\System.Web.Extensions.DLL' Is it possible to run modules using either framework or do I need to recompile all of my 2.0 modules against 3.5?

<p>But then my 2.0 modules lose their reference for UpdatePanels.&#160; Do I&#160;need to convert them all to 3.5 so they can reference the newer System.Web.Extensions?</p>

I fixed this last week and forgot to update this thread:

I needed to add this to the <assemblyBinding> section of my web.config

<dependentAssembly>
   <assemblyIdentity name="System.Web.Extensions" publicKeyToken="31bf3856ad364e35"/>
   <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/>
</dependentAssembly>