Could not load file or assembly 'System.Data.Services.Client, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089

Question

when i run my projects i have following error as follows.

Could not load file or assembly 'System.Data.Services.Client, Version=3.5.0.0, Culture=neutral, 

PublicKeyToken=b77a5c561934e089.

for this what to do.please help me.

please give solution.