string tempImagePath = Application.StartupPath;
string temp =
tempImagePath + "\\CurrentScreenImage";
Directory.CreateDirectory(@temp);
Image i = new
Bitmap(this.Width, this.Height);
Graphics g =
Graphics.FromImage(i);
g.CopyFromScreen(new
Point(this.Location.X, this.Location.Y), new Point(0, 0) , new Size(this.Width,
this.Height));
i.Save(@temp + "\\" +
DateTime.Now.ToString("yyyyMMdd") + ".jpg");
g.Dispose();
MessageBox.Show("OK");
原文：http://www.cnblogs.com/tiankong2012/p/3526010.html