public virtual void PreExecute(DataOperation dataOperation, ref DataResult rslt)
 {
     rslt = CreateResult();
 }
 public virtual void ExecuteOperation(DataOperation dataOperation, ref DataResult rslt)
 {
 }
 public virtual void PostExecute(DataOperation dataOperation, ref DataResult rslt)
 {
 }
 public virtual DataResult CreateResult()
 {
     DataResult rslt = new DataResult();
     return rslt;
 }