在pictureBox1上绘制Bitmap图像的问题？

[jinguowei]

#region 设置pictureBox1的大小,并将位图对象加载到控件上

//3 设置pictureBox1的大小,并将位图对象加载到控件上，

//3.1 设置pictureBox1的大小
pictureBox1.Width = bm.Width;
pictureBox1.Height = bm.Height;


//3.2 将位图加载到pictureBox1上
pictureBox1.Image = bm;

#endregion




#region 设置pictureBox1的大小,并将位图对象画到控件pictureBox1上.这样绘图一闪就没了？？？
////设置pictureBox1的大小
//pictureBox1.Size = new Size(bm.Width, bm.Height);
////将位图对象画到控件pictureBox1上
//Graphics g2 = pictureBox1.CreateGraphics();
//g2.DrawImage(image, 0, 0);

#endregion

[赵4老师]

绘图操作应该放在OnDraw中？