take screen shot after each 5 minuts

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C#

hi!
i have created an app that takes a screen shot of my desktop after clicking on the button.here is the code:

private void button1_Click(object sender, EventArgs e)
       {
           this.Hide();
           timer1.Start();
       }

       private void timer1_Tick(object sender, EventArgs e)
       {
           Bitmap b = new Bitmap(ScreenWidth, ScreenHeight);
           g = Graphics.FromImage(b);
           g.CopyFromScreen(Point.Empty, Point.Empty, Screen.PrimaryScreen.Bounds.Size);
           pictureBox1.Image = b;
           this.Show();
           button2.Enabled = true;
           timer1.Stop();
       }

what i want is to make it automatic. so that it automatically takes the desktop screen shot after every 5 minutes.
please tell me how to do it.
thanks in advance