public void Remove(object obj)
 {
     FieldCollection.Remove(obj);
 }
 public Field Add(Field obj)
 {
     return(FieldCollection.Add(obj));
 }
 public void Clear()
 {
     FieldCollection.Clear();
 }
 public IEnumerator GetEnumerator()
 {
     return(FieldCollection.GetEnumerator());
 }