TaskbarNotifier, a skinnable MSN Messenger-like popup in C# and now in VB.NET too

int left, top, width, height;
switch (taskbarState)
{
  case TaskbarStates.hidden:
    taskbarState = TaskbarStates.appearing;
    this.Opacity = 0.0;
    left = WorkAreaRectangle.Right - BackgroundBitmap.Width - nPadding - nBaseWindowRight;
    top = WorkAreaRectangle.Bottom - BackgroundBitmap.Height - nPadding - nBaseWindowBottom;
    width = BackgroundBitmap.Width;
    height = BackgroundBitmap.Height;
    SetWindowPos(this.Handle, -1, left, top, width, height, 0x0010);
    timer.Interval = nShowEvents;
    timer.Start();
 
    // Show the popup without stealing focus
    ShowWindow(this.Handle, 4);
    break;
 
  case TaskbarStates.appearing:
    Refresh();
    break;
 
  case TaskbarStates.visible:
    timer.Stop();
    timer.Interval = nVisibleEvents;
    timer.Start();
    Refresh();
    break;
 
  case TaskbarStates.disappearing:
    timer.Stop();
    taskbarState = TaskbarStates.visible;
    left = WorkAreaRectangle.Right - BackgroundBitmap.Width - nPadding - nBaseWindowRight;
    top = WorkAreaRectangle.Bottom - nPadding - nBaseWindowBottom;
    width = BackgroundBitmap.Width;
    height = 0;
    SetWindowPos(this.Handle, -1, left, top, width, height, 0x0010);
    timer.Interval = nVisibleEvents;
    timer.Start();
    Refresh();
    break;
}

#region TaskbarNotifier Constructor
/// <summary>
/// The Constructor for TaskbarNotifier
/// </summary>
public TaskbarNotifier()
{
	// Window Style
	FormBorderStyle = FormBorderStyle.None;
	WindowState = FormWindowState.Minimized;
	base.Show();
	base.Hide();
	WindowState = FormWindowState.Normal;
	ShowInTaskbar = false;
	//TopMost = true;
	MaximizeBox = false;
	MinimizeBox = false;
	ControlBox = false;
	
	timer.Enabled = true;
	timer.Tick += new EventHandler(OnTimer);
}
#endregion

[DllImport("user32.dll")]
protected static extern bool SetWindowPos(IntPtr hWnd,
  Int32 hWndInsertAfter, Int32 X, Int32 Y, Int32 cx, Int32 cy, uint uFlags);

/// <summary>
/// Displays the popup for a certain amount of time
/// </summary>
/// <param name="strTitle">The string which will be shown as the title of the popup</param>
/// <param name="strContent">The string which will be shown as the content of the popup</param>
/// <param name="nTimeToShow">Duration of the showing animation (in milliseconds)</param>
/// <param name="nTimeToStay">Duration of the visible state before collapsing (in milliseconds)</param>
/// <param name="nTimeToHide">Duration of the hiding animation (in milliseconds)</param>
/// <returns>Nothing</returns>
public void Show(string strTitle, string strContent, int nTimeToShow, int nTimeToStay, int nTimeToHide)
{
	WorkAreaRectangle = Screen.GetWorkingArea(WorkAreaRectangle);
	titleText = strTitle;
	contentText = strContent;
	nVisibleEvents = nTimeToStay;
	CalculateMouseRectangles();
 
	// We calculate the pixel increment and the timer value for the showing animation
	int nEvents;
	if (nTimeToShow > 10)
	{
		nEvents = Math.Min((nTimeToShow / 10), BackgroundBitmap.Height);
		nShowEvents = nTimeToShow / nEvents;
		nIncrementShow = BackgroundBitmap.Height / nEvents;
	}
	else
	{
		nShowEvents = 10;
		nIncrementShow = BackgroundBitmap.Height;
	}
 
	// We calculate the pixel increment and the timer value for the hiding animation
	if( nTimeToHide > 10)
	{
		nEvents = Math.Min((nTimeToHide / 10), BackgroundBitmap.Height);
		nHideEvents = nTimeToHide / nEvents;
		nIncrementHide = BackgroundBitmap.Height / nEvents;
	}
	else
	{
		nHideEvents = 10;
		nIncrementHide = BackgroundBitmap.Height;
	}
 
	switch (taskbarState)
	{
		case TaskbarStates.hidden:
			taskbarState = TaskbarStates.appearing;
			SetWindowPos(
				this.Handle, 
				-1, 
				WorkAreaRectangle.Right - BackgroundBitmap.Width, 
				WorkAreaRectangle.Bottom - BackgroundBitmap.Height, 
				BackgroundBitmap.Width, 
				BackgroundBitmap.Height, 
				0x0010
			);
			timer.Interval = nShowEvents;
			timer.Start();
			// We Show the popup without stealing focus
			ShowWindow(this.Handle, 4);
			break;
 
		case TaskbarStates.appearing:
			Refresh();
			break;
 
		case TaskbarStates.visible:
			timer.Stop();
			timer.Interval = nVisibleEvents;
			timer.Start();
			Refresh();
			break;
 
		case TaskbarStates.disappearing:
			timer.Stop();
			taskbarState = TaskbarStates.visible;
			SetWindowPos(
				this.Handle, 
				-1, 
				WorkAreaRectangle.Right - BackgroundBitmap.Width, 
				WorkAreaRectangle.Bottom, 
				BackgroundBitmap.Width, 
				0, 
				0x0010
			);
			timer.Interval = nVisibleEvents;
			timer.Start();
			Refresh();
			break;
	}
}

    case TaskbarStates.appearing:
        BringToFront();
        Refresh();
        break;