Automatically take the screen shot of the current page using C#

using System.Drawing;
using System.IO;
using System.Drawing.Imaging;

Bitmap bitmap = new Bitmap(128, 102);
Graphics graphics = Graphics.FromImage(bitmap as Image);
graphics.CopyFromScreen(0, 0, 0, 0, bitmap.Size);
bitmap.Save(@"c:\temp\screenshot.bmp", ImageFormat.Bmp);