DataGridView多维表头的实现方法

                     return;
                 }
                 if (value > _endY)
                 {
                     _startY = _endY;
                     return;
                 }
                 if (value < 0) _startY = 0;
                 else _startY = value;
             }
         }

         public int EndX
         {
             get { return _endX; }
             set
             {
                 if (_baseHeader)
                 {
                     _endX = _startX;
                     return;
                 }
                 if (value < _startX)
                 {
                     _endX = _startX;
                     return;
                 }
                 _endX = value;
             }
         }

         public int EndY