GIF animate

Bitmap banimage;
EventHandler eh;

[...]

private void start_animation()
{
    banimage = new Bitmap("banimage.gif");
    eh = new EventHandler(OnFrameChanged);
    ImageAnimator.Animate(banimage, eh);
}

private void OnFrameChanged(object o, EventArgs e)
{
    ImageAnimator.UpdateFrames();
    pictureBox4.Invalidate();
}

private void pictureBox4_Paint(object sender, PaintEventArgs e)
{
    e.Graphics.DrawImage(banimage, 0, 0);
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Imaging;

namespace Freeteo.Web.ContentManagement.Controlli
{
    public partial class PictureBoxAnimated : PictureBox
    {
        System.Timers.Timer timeRefresh = new System.Timers.Timer(100);

        List<Image> pagine = new List<Image>();
        Image immagine;
        public new Image Image
        {
            get { return immagine; }
            set
            {
                immagine = value;
                FrameDimension frameDim = new FrameDimension(immagine.FrameDimensionsList[0]);
                int frameCount = immagine.GetFrameCount(frameDim);
                
                //--- se ha piu' immagini dentro (quindi gif animata)
                if (frameCount > 1)
                {
                    for (int i = 0; i < frameCount; i++)
                    {
                        immagine.SelectActiveFrame(frameDim, i);
                        pagine.Add(immagine.Clone() as Image);
                    }

                    timeRefresh.Enabled = true;
                }
                else
                    base.Image = immagine;
            }
        }





        public PictureBoxAnimated()
        {
            InitializeComponent();

            Control.CheckForIllegalCrossThreadCalls = false;

            timeRefresh.Elapsed += new System.Timers.ElapsedEventHandler(timeRefresh_Elapsed);
        }



        int i = 0;
        void timeRefresh_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            //--- se sono in design di visual studio
            if (DesignMode && base.Image == null)
            {
                base.Image = immagine;
                return;
            }


            if (Visible)
            {
                using (Graphics graph = this.CreateGraphics())
                {
                    graph.Clear(this.BackColor);
                    graph.DrawImage(pagine[i++ % pagine.Count], 0, 0, this.Width, this.Height);
                }
            }
            
        }


    }
}