Could not load type 'System.Data.Services.Providers.IDataServiceUpdateProvider' from assembly

In this article we will be seeing how to resolve the error "Could not load type 'System.Data.Services.Providers.IDataServiceUpdateProvider' from assembly 'System.Data.Services, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'".

Error:

When you try to access the SharePoint list using REST API through the URL http://servername:12345/_vti_bin/listdata.svc you may be getting the following error.

Reason:

The reason for the error would be you may not have installed ADO.Net Data Services in your computer server.

ADO.Net Data Services:

• For Windows Vista and Windows 2008 -http://www.microsoft.com/downloads/details.aspx?familyid=4B710B89-8576-46CF-A4BF-331A9306D555&displaylang=en

• For Windows 7 and Windows 2008 R2 -http://www.microsoft.com/downloads/details.aspx?familyid=79d7f6f8-d6e9-4b8c-8640-17f89452148e&displaylang=en

Note: Download the files appropriate to you or else when you try to install you would be getting the following error.

Windows 2008 R2:

For Windows 2008 R2 select the following one

Install ADO. Net Data Services:

• Open the downloaded file.
  

• Windows Update Standalone Installer wizard will pop up.
  

• Click on Yes.

• Restart your server.

• Now try to access the list using API, you would be able to access the list successfully.