int rows = 10, cols = 10, w = 0,h=0;
        private void panel1_Paint_2(object sender, PaintEventArgs e)
        {
            w = panel1.Width / cols;
            h = panel1.Height / rows;
            w = Math.Min(w, h);
            for (int i = 0; i < cols;i++ )
            {
                for (int j = 0; j < rows; j++)
                {
                    e.Graphics.DrawRectangle(Pens.Red, new Rectangle(w*i,w*j,w,w));
                }