CRM 2011 QueryExpresison - Guid si Bilinen Teklifi Çekme (Get Quote)

   public static Quote GetQuote(IOrganizationService ser, Guid quoteid, ColumnSet columnset)
        {
            try
            {
                QueryExpression query = GetQueryExpressionSingle("quote", "quoteid", quoteid, columnset);
                EntityCollection ec = ser.RetrieveMultiple(query);
                if (ec != null && ec.Entities.Count == 1)
                    return (Quote)ec.Entities[0];
                else
                    return new Quote();
            }
            catch (Exception ex)
            {
               FileLogHelper.LoggEx(ex, typeof(CrmManagerStatic), "public static Quote GetQuote(IOrganizationService ser, Guid quoteid, ColumnSet columnset)" + Environment.NewLine +
                                                                    "QuoteId :" + CommonFunction.ToString(quoteid));
                throw ex;
            }
        }

GetQueryExpressionSingle metodu