[C#] 스크롤 이벤트

private void Mouse_Wheel(object sender, MouseEventArgs e) 
{ 
      if (e.Delta < 0) //스크롤 내릴때
      {
            if (this.vScrollBar1.Value + Math.Abs(e.Delta) > this.vScrollBar1.Maximum)
            {
                  this.vScrollBar1.Value = this.vScrollBar1.Maximum;
            }
            else
            {
                  this.vScrollBar1.Value = this.vScrollBar1.Value + Math.Abs(e.Delta);
             }
      }
      else if (e.Delta > 0 && this.vScrollBar1.Value > 0) //스크롤 올릴때
      {
            if (this.vScrollBar1.Value - Math.Abs(e.Delta) < 0)
            {
                  this.vScrollBar1.Value = 0;
            }
            else
            {
                  this.vScrollBar1.Value = this.vScrollBar1.Value - Math.Abs(e.Delta);
            }
      }
}