public override bool IsValid()
 {
     if (!String.IsNullOrEmpty(NameTable) && (ColumnInTable.Count(c => c.isValid) == ColumnInTable.Count))
     {
         return(true);
     }
     return(false);
 }
 public override bool IsValid()
 {
     return(ColumnInTable.Count(c => c.IsSelect) > 0 ? true : false);
 }