private void button1_Click(object sender, EventArgs e)
        {
            System.Drawing.Graphics grafiknesne;
            grafiknesne = this.CreateGraphics();
            Pen firca = new Pen(System.Drawing.Color.Red, 3);//Renk,Kalınlık
            grafiknesne.DrawRectangle(firca, 25, 45, 200, 100);//firca,x,y,genişlik,yükseklik
            Pen firca1 = new Pen(System.Drawing.Color.Blue, 4);//Renk,Kalınlık
            grafiknesne.DrawRectangle(firca1, 35, 80, 80, 80);
        }