说明: int bitmapHeight = button1.Top- 20 
 bitmap = new Bitmap(bitmapWidth, bitmapHeight, this.CreateGraphics()) 
 Graphics g = Graphics.FromImage(bitmap) 
 g.Clear(this.BackColor) 
 g.FillEllipse(new SolidBrush(Color.YellowGreen),5,5 ,bitmapWidth 
<power> 在 2008-10-13 上传
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