How to set up C# brush pen to save and restore graphic objects

using System;
using ;
using ;
using ;
using ;
using ;
using ;
using .Drawing2D;
namespace WindowsApplication2
{
  public partial class Form11 : Form
  {
    public Form11()
    {
      InitializeComponent();
    }
    private void button1_Click(object sender, EventArgs e)
    {
      LinearGradientBrush brush = new LinearGradientBrush(, , , 100);
      ColorBlend blend = new ColorBlend();
       = new Color[] { , ,  };
       = new float[] { 0, .5f, 1 };
       = blend;
      Pen pen5 = new Pen(brush);
      Graphics g5 = ();
      Point[] p = new Point[] { new Point(0, 0), new Point(100, 100), new Point(50, 100), new Point(200, 100) };
      GraphicsState old = ();
       = ;
      (old);
      (pen5,p);
    }
  }
}