CRM 2011 Sdk RetrieveRequest sample

RetrieveRequest will retrive single refence entity based on the record guid.

//Create the target
        EntityReference retrieveTarget = new EntityReference();
                retrieveTarget.Id = entityId;
                retrieveTarget.LogicalName = entityType;

                //Create a request
                RetrieveRequest retrieveRequest = new RetrieveRequest();
                retrieveRequest.ColumnSet = new Microsoft.Xrm.Sdk.Query.ColumnSet(true);
                retrieveRequest.Target = retrieveTarget;

                //Execute the request
                RetrieveResponse retrieveResponse = (RetrieveResponse)service.Execute(retrieveRequest);

                //Retrieve the Loan Application Entity
                return (Entity)retrieveResponse.Entity;