System.ComponentModel.MaskedTextProvider.RemoveAt C# (CSharp) Method

        public bool RemoveAt(int startPosition, int endPosition)
        {
            int dummyVar;
            MaskedTextResultHint dummyVar2;
            return RemoveAt(startPosition, endPosition, out dummyVar, out dummyVar2);
        }

        private bool CanDelete( int startPosition, int selectionLength, bool deleteForward, MaskedTextProvider provider )
        {
            if( this.IsReadOnly )
            return false;

              if( selectionLength == 0 )
              {
            if( !deleteForward )
            {
              if( startPosition == 0 )
            return false;

              startPosition--;
            }
            else if( ( startPosition + selectionLength ) == provider.Length )
            {
              return false;
            }
              }

              MaskedTextResultHint notUsed;
              int tentativeCaretPosition = startPosition;

              int endPosition = ( selectionLength > 0 ) ? ( ( startPosition + selectionLength ) - 1 ) : startPosition;

              bool success = provider.RemoveAt( startPosition, endPosition, out tentativeCaretPosition, out notUsed );

              return success;
        }