private void 保存图片ToolStripMenuItem_Click(object sender, EventArgs e)
{
int h = costPS.Size.Height;
int w = costPS.Size.Width;
Bitmap bmp = new Bitmap(w, h);
Rectangle rt = new Rectangle(0, 0, w, h);
costPS.DrawToBitmap(bmp, rt);
bmp.Save("d:\\tmp\\abc.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
MessageBox.Show("已经保存");
}