Could not load type 'System.Data.Services.Providers.IDataServiceUpdateProvider' from assembly 'System.Data.Services, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

Question

When I tried to see this service http://win-j8t24f4b519/_vti_bin/listdata.svc

I got this error What should I do?

Answer 1

The problem is that I had not installed Ado.net data services!

Answer 2

Another thing to check is to see if the assembly actually is in the GAC (C:\windows\assembly).