public MeterDeltaForPCSessionResult GetMeterDeltaForPCSession(int installationNo, string pCcardNo, string sessionType)
 {
     try
     {
         using (ExCommsSQLDataAccess DataContext = this.GetDataContext())
         {
             return(DataContext.rsp_GetMeterDeltaForPCSession(installationNo, pCcardNo, sessionType).FirstOrDefault());
         }
     }
     catch (Exception ex)
     {
         Log.Exception(ex);
         return(new MeterDeltaForPCSessionResult());
     }
 }