public CharacterConstraint(ref DataTypeString data, bool an, bool s, bool p)
 {
     _dataType = data;
       _alphanumeric = an;
       _specials = s;
       _space = p;
 }
 public MinLengthConstraint(ref DataTypeString data, int min)
 {
     _dataType = data;
       _min = min;
 }