How to create write the code for taking snapshot using webcam

I have done this by doing followong method:

private void btnSnap_Click(object sender, EventArgs e)
        {

            pictureBox1.Image = pictureBox2.Image;
            if (FinalVideo.IsRunning)
            {
                FinalVideo.Stop();  
            }
        }

//where pictureBox1 is for webcam
//and
// pictureBox2 is for the snaping the the picture from pictureBox1.