顏色漸變矩形的畫法

protected override void OnPaint(PaintEventArgs pe)
{
Graphics g = pe.Graphics ;
//設置矩形區域的位置和大小
Rectangle rect = new Rectangle(0, 0, 200, 200);
//使填充矩形的顏色從紅色到黃色漸變
LinearGradientBrush lBrush = new LinearGradientBrush(rect, Color.Red, Color.Yellow,
LinearGradientMode.BackwardDiagonal);
g.FillRectangle(lBrush, rect);
}