SharePoint 2010 -SVC service Exception :'System.Data.Services.Providers.IDataServiceUpdateProvider'

SharePoint 2010 has List data web service However many users trying to access get following exception :   http://yoursite/_vti_bin/ListData.svc

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

Remedy:

Installation needed on SharePoint web front end servers: ADO.NET Data Services Update for .NET Framework 3.5 SP1 for Windows 7 and Windows Server 2008 R2

Click to Download -- ADO.NET Data Services Update for .NET Framework.