Fenster animiert öffnen und schließen

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using System.Runtime.InteropServices

public partial class Form1 : Form
{
  public Form1()
  {
      InitializeComponent();
      Button Button1 = new Button();
      Controls.Add(Button1);
      Button1.Location = new Point((Width - Button1.Width) / 2, Height - 80);
      Button1.Text = "Schließen";
      Button1.Click += new EventHandler(Button1_Click);
  }

  public new void Show()
  {
     AnimateWindow(this.Handle, 500, AW_BLEND | AW_ACTIVATE );
      // Wichtig, sonst sieht man nur ein leeres Fenster...
      Visible = true;
  }

  public new void Close()
  {
      if (IsDisposed == false)
      {
        AnimateWindow(this.Handle, 400, AW_HIDE | AW_BLEND);
        base.Close();
      }
  }

  void Button1_Click(object sender, EventArgs e)
  {
      Close();
  }


  [STAThread]
  static void Main()
  {
    Form1 f = new Form1();
    // Wichtig: Application.Run benutzt eine anderen Mechanismus, daher muss es schon vorher angezeigt werden
    f.Show();
    Application.Run(f);
  }

  #region Win32
  const int AW_HIDE = 0X10000;
  const int AW_ACTIVATE = 0X20000;
  const int AW_SLIDE = 0X40000;
  const int AW_BLEND = 0X80000;
  const int AW_HOR_POSITIVE = 0X1;
  const int AW_HOR_NEGATIVE = 0X2;
  const int AW_VER_POSITIVE = 0x4;
  const int AW_VER_NEGATIVE = 0x8;
  const int AW_CENTER = 0x10;

  [DllImport("user32.dll", CharSet = CharSet.Auto)]
  private static extern int AnimateWindow(IntPtr hwand, int dwTime, int dwFlags);
  #endregion
}