E.g.: draw line, circle, triangle

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

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

private void Form1_Load(object sender, EventArgs e)
{

}

private void button1_Click(object sender, EventArgs e)
{
Graphics g = this.CreateGraphics();
Pen p = new Pen(Color.Black, 2);
g.DrawLine(p, 10, 10, 100, 100);

g.Dispose();
}

private void button2_Click(object sender, EventArgs e)
{
Graphics g = this.CreateGraphics();
Pen p = new Pen(Color.Black, 2);
g.FillPolygon(Brushes.White, new Point[3] { new Point(10, 310), new Point(40, 260), new
Point(70, 310) });
g.DrawPolygon(p, new Point[3] { new Point(10, 310), new Point(40, 260), new Point(70, 310) });
g.Dispose();
}

private void button3_Click(object sender, EventArgs e)
{
Graphics g = this.CreateGraphics();
Pen p = new Pen(Color.Black, 2);
g.FillEllipse(Brushes.White, 15, 100, 50, 50);
g.DrawEllipse(p, 100, 100, 100, 100);
g.Dispose();
}

private void button4_Click(object sender, EventArgs e)
{
Graphics g = this.CreateGraphics();
g.Clear(Color.White);
g.Dispose();
}
}
}