C# Signature:

[DllImport("user32")]
static extern bool AnimateWindow(IntPtr hwnd, int time, AnimateWindowFlags flags);

VB Signature:

Imports System.Runtime.InteropServices

<DllImport("user32.dll")> _
Shared Function AnimateWindow(ByVal hwnd As IntPtr, ByVal time As Integer, ByVal flags As AnimateWindowFlags) As Boolean
End Function

User-Defined Types:

AnimateWindowFlags should be used for the dwFlags parameter.

Notes:

Don’t forget to use the AnimateWindowFlags!

Tips & Tricks:

To get an animation to run in reverse, to say, animate the window closing use some thing like:

Dim f2 As New Form2
AnimateWindow(f2.Handle, 1000, AnimateWindowFlags.AW_VER_NEGATIVE Or AnimateWindowFlags.AW_SLIDE or AnimateWindowFlags.AW_HIDE)
f2.Show()

The AW_HIDE will make any of the animations run in reverse.

AnimateWindow doesn't actually show the window so make sure you call Show() or set this.Visible = true after calling AnimateWindow

C# Sample Code:

This assumes that the AnimateWindow function is declared inside class User32

Form2 f2 = new Form2();
AnimateWindow(f2.Handle, 1000, (uint) AnimateWindowFlags.AW_VER_NEGATIVE | (uint) AnimateWindowFlags.AW_SLIDE);
f2.Show();

VB.NET Sample Code:

Dim f2 As New Form2
AnimateWindow(f2.Handle, 1000, AnimateWindowFlags.AW_VER_NEGATIVE Or AnimateWindowFlags.AW_SLIDE or AnimateWindowFlags.AW_HIDE)
f2.Show()

Alternative Managed API:

None