I tried my level best but capuring copy from screen full height is not coming

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C#

My Code as follows

protected void btnCaptures_Click(object sender, EventArgs e)
   {
           Bitmap bitmap = new Bitmap
          (System.Windows.Forms.Screen.PrimaryScreen.Bounds.Width,           System.Windows.Forms.Screen.PrimaryScreen.Bounds.Height);
           Graphics graphics = Graphics.FromImage(bitmap as System.Drawing.Image);
           graphics.CopyFromScreen(0, 0, 0, 0, bitmap.Size);
           bitmap.Save(Server.MapPath(@"Screen\ScreenShot2.Bmp"), ImageFormat.Bmp);
   }

I tried my above serveral times, but when i run the above code in Screen folder copy fromscreen full height i cannot able to get.

for that getting a full height from copyfromscreen what changes i want to go in above code.