public virtual List <tbt_MonthlyBillingHistory> GetLastBillingHistory(string contractCode, string billingOCC, string c_CURRENCY_LOCAL, string c_CURRENCY_US) { BLDataEntities context = new BLDataEntities(); return(context.GetLastBillingHistory(contractCode, billingOCC, c_CURRENCY_LOCAL, c_CURRENCY_US).ToList()); }