public bool IsCardSessionExists(int installationNo, int cardNo)
 {
     try
     {
         using (ExCommsSQLDataAccess DataContext = this.GetDataContext())
         {
             var result = DataContext.IsCardSessionExists(installationNo, cardNo).FirstOrDefault();
             return(result != null);
         }
     }
     catch (Exception ex)
     {
         Log.Exception(ex);
         return(false);
     }
 }