C# manual double buffering technology usage example analysis

using System;
using ;
using ;
using ;
using ;
using ;
using ;
namespace advanced_drawing
{
  public partial class Form19 : Form
  {
    BufferedGraphicsContext bufferContext;
    Bitmap gif = new Bitmap(@"d:/My Documents/Desktop/ico/");
    public Form19()
    {
      InitializeComponent();
      bufferContext = new BufferedGraphicsContext();
       = ;
    }
    void gif_FrameChanged(object sender, EventArgs e)
    {
      Graphics g = ();
      BufferedGraphics frame = (g, );
      (gif);
      (gif, );
      ();
    }
    private void Form19_FormClosing(object sender, FormClosingEventArgs e)
    {
      ();
    }
    private void Form19_Paint(object sender, PaintEventArgs e)
    {
      if ((gif))
      {
        (gif, gif_FrameChanged);
      }
    }
  }
}