I just upgraded my Web Site project from 2.0 to 3.5 to take advantage of the TimeZoneInfo class. When I did this, I started getting an ambiguous assembly error (*see below). The problem is, I'm not using ScriptManager, an old version of SyncFusion is. I can't upgrade SyncFusion right now, so I need to tell ASP.NET to use version 1.0.61025.0 of the assembly.

I ripped out all of the 3.5 script stuff from the web.config and adding bindingRedirects to it, but it didn't work.

<runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
        <dependentAssembly>
            <assemblyIdentity name="System.Web.Extensions" publicKeyToken="31bf3856ad364e35" />
            <bindingRedirect oldVersion="3.5.0.0" newVersion="1.0.61025.0" />
        </dependentAssembly>
        <dependentAssembly>
            <assemblyIdentity name="System.Web.Extensions.Design" publicKeyToken="31bf3856ad364e35" />
            <bindingRedirect oldVersion="3.5.0.0" newVersion="1.0.61025.0" />
        </dependentAssembly>
    </assemblyBinding>
</runtime>

The type 'System.Web.UI.ScriptManager' is ambiguous: it could come from assembly 'C:\inetpub\wwwroot\xxx\bin\System.Web.Extensions.DLL' or from assembly 'C:\WINDOWS\assembly\GAC_MSIL\System.Web.Extensions\3.5.0.0__31bf3856ad364e35\System.Web.Extensions.dll'. Please specify the assembly explicitly in the type name.