illustrates the use of Pens and Lines : Line : Graphics C# Source Code

    

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

  public class Example21_1 : System.Windows.Forms.Form
  {
    private System.ComponentModel.Container components = null;

    public Example21_1()
    {
      InitializeComponent();
    }

    protected override void Dispose( bool disposing )
    {
      if( disposing )
      {
        if (components != null) 
        {
          components.Dispose();
        }
      }
      base.Dispose( disposing );
    }

    private void InitializeComponent()
    {
      this.BackColor = System.Drawing.Color.White;
      this.ClientSize = new System.Drawing.Size(400, 400);
      this.Paint += new System.Windows.Forms.PaintEventHandler(this.Example21_1_Paint);
    }


    static void Main() 
    {
      Application.Run(new Example21_1());
    }

    private void Example21_1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {
      Graphics g = e.Graphics;
      Pen p = new Pen(Color.Black, 10);
      g.DrawLine(p, 25, 25, 375, 375);
    }
  }