using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using System.Drawing.Drawing2D;namespace WindowsApplication2{  public partial class Form11 : Form  {    public Form11()    {      InitializeComponent();    }    private void button1_Click(object sender, EventArgs e)    {      Pen pen = new Pen(Color.Blue, 12);      pen.EndCap = LineCap.DiamondAnchor;      Graphics g = this.CreateGraphics();      g.DrawLine(pen, 10, 50, 100, 50);    }  }}