c# windowsforms 6

using System;
using System.Drawing;
using System.Windows.Forms;

namespace Лаба_6
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Clear_Click(object sender, EventArgs e)
        {
            Graphics clear = Graphics.FromHwnd(Picture.Handle);
            clear.Clear(BackColor);
        }

        private void Square_Click(object sender, EventArgs e)
        {
            Graphics clear = Graphics.FromHwnd(Picture.Handle);
            clear.Clear(BackColor);

            Graphics square = Picture.CreateGraphics();
            Pen pen = new Pen(Color.Black, 3f);
            Rectangle rect = new Rectangle(165, 60, 250, 250);
            square.DrawRectangle(pen, rect);
            square.Dispose();
        }

        private void Circle_Click(object sender, EventArgs e)
        {
            Graphics clear = Graphics.FromHwnd(Picture.Handle);
            clear.Clear(BackColor);

            Graphics circle = Picture.CreateGraphics();
            Pen pen = new Pen(Color.Black, 3f);
            RectangleF rect = new RectangleF(165, 60, 250, 250);
            circle.DrawEllipse(pen, rect);
            circle.Dispose();
        }

        private void Triangle_Click(object sender, EventArgs e)
        {
            Graphics clear = Graphics.FromHwnd(Picture.Handle);
            clear.Clear(BackColor);

            Graphics triangle = Picture.CreateGraphics();
            Pen pen = new Pen(Color.Black, 3f);
            Point[] points = { new Point(290, 60), new Point(120, 320), new Point(460, 320) };
            triangle.DrawPolygon(pen, points);
            triangle.Dispose();
        }
    }
}