Icone impazzite windows form

public Bitmap GetBitmap(Form frm)
     {
         Rectangle rect = new Rectangle(0, 0, frm.Width , frm.Height );
         Bitmap bmp = new Bitmap( rect.Width, rect.Height);
         this.DrawToBitmap(bmp, rect);
         return bmp;
       }

     private void Form1_MouseDoubleClick(object sender, MouseEventArgs e)
     {
        Bitmap bmp = GetBitmap(this);
        bmp.Save("c:\\frmTobmp.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
        bmp.Dispose();
     }