Анимация боковой панели

Slider(C#)

using System;
using System.Drawing;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace Diploma
{
    public partial class Form1 : Form
    {
        Bitmap RotatingBlocks;
        Point DrawHere;
        Rectangle InvalidRect;
        public Form1()
        {
            InitializeComponent();
        }
        
         //FOR SLIDER----------------------------------------------------------------------------
        public static class Util
        {
            public enum Effect { Roll, Slide, Center, Blend}
            public static void Animate(Control ctl, Effect effect, int msec, int angle)
            {
                int flags = effmap[(int)effect];
                if (ctl.Visible)
                    {  flags |= 0x10000; angle += 180; }
                else
                    {
                        if (ctl.TopLevelControl == ctl) flags |= 0x20000;
                        else if (effect == Effect.Blend) throw new ArgumentException();
                    }

                flags |= dirmap[(angle % 360) / 45];
                bool ok = AnimateWindow(ctl.Handle, msec, flags);
                if (!ok) throw new Exception("Animation failed");
                ctl.Visible = !ctl.Visible;
            }

            private static int[] dirmap = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
            private static int[] effmap = { 0, 0x40000, 0x10, 0x80000 };
            [DllImport("user32.dll")]
            private static extern bool AnimateWindow(IntPtr handle, int msec, int flags);
        }
        //------------------------------------------------------------------------------------
        
         private void pnOpen_Click(object sender, EventArgs e)
        {
            // Загрузка анимации для боковой панели
            Util.Animate(panel1, Util.Effect.Center, 200, 10);
        }