Could not load type ‘System.Data.Services.Providers.IDataServiceUpdateProvider’ from assembly ‘System.Data.Services, Version=3.5.0.0, Culture=neutral,

I wanted to use the new REST services in SharePoint 2010. But when I navigated to the ListData.svc service. I got the following error:


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

does not provide many hints to what is causing this error. Most sites suggest to install ADO.NET Data Services v1.5 CTP2, but I already had.

I have found solution from one of sharepoint blog which asking to install dll patch on sharepoint server.


For Windows 7 AND Windows Server 2008 R2Download the ADO.NET Data Services Update for .NET Framework 3.5 SP1 for Windows 7 and Windows Server 2008 R2.

After installing the version of the System.Data.Services.dll file is 3.5.30729.5004.

For Windows 2000, Windows XP, Windows Vista, Windows Server 2003 AND Windows Server 2008Download the ADO.NET Data Services Update for .NET Framework 3.5 SP1 for Windows 2000, Windows Server 2003, Windows XP, Windows Vista and Windows Server 2008.

After installing the version of the System.Data.Services.dll file is 3.5.30729.4466.