private void button1_Click(object sender, EventArgs e)
 
{
 
this.BackgroundImage= CaptureScreen();
 
}
 
 
 
private Image CaptureScreen()
 
{
 
Bitmap screen = new Bitmap(Screen.PrimaryScreen.Bounds.Width,
 
Screen.PrimaryScreen.Bounds.Height);
 
using (Graphics g = Graphics.FromImage(screen))
 
{
 
g.CopyFromScreen(0, 0, 0, 0, screen.Size);
 
}
 
return screen;
 
}