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using System.ServiceModel.DomainServices.Hosting;
using System.ServiceModel.DomainServices.Server;
using System.ServiceModel

 

try to take it from  :

C:\Program Files (x86)\Microsoft SDKs\RIA Services\v1.0\Libraries\Server\

 

If you don’t have it goto -  http://www.silverlight.net/getstarted/riaservices/