C# TrayIcon Class

using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Text;
using Microsoft.Win32;
using System.Windows.Forms;

namespace XXXX
{
public class TrayIcon
{
//Declare click event
public event System.EventHandler Click;

private WindowSink windowSink;
private int uID = 11000;

//Constructor
public TrayIcon()
{
//Create instance of the MessageWindow subclass
windowSink = new WindowSink(this);
windowSink.uID = uID;
}

//Destructor
~TrayIcon()
{
Remove();
}


public void Add(IntPtr hIcon)
{
TrayMessage(windowSink.Hwnd, NIM_ADD, (uint)uID, hIcon);
}

public void Remove()
{

TrayMessage(windowSink.Hwnd, NIM_DELETE, (uint)uID, IntPtr.Zero);
}

public void Modify(IntPtr hIcon)
{

TrayMessage(windowSink.Hwnd, NIM_MODIFY, (uint)uID, hIcon);

}

private void TrayMessage(IntPtr hwnd, int dwMessage, uint uID, IntPtr hIcon)
{
NOTIFYICONDATA notdata = new NOTIFYICONDATA();

notdata.cbSize = 152;
notdata.hIcon = hIcon;
notdata.hWnd = hwnd;
notdata.uCallbackMessage = WM_NOTIFY_TRAY;
notdata.uFlags = NIF_MESSAGE | NIF_ICON;
notdata.uID = uID;

int ret = Shell_NotifyIcon(dwMessage, ref notdata);
}

#region API Declarations

internal const int WM_LBUTTONDOWN = 0x0201;
internal const int WM_RBUTTONUP = 0x0205;
//User defined message
internal const int WM_NOTIFY_TRAY = 0x0400 + 2001;

internal const int NIM_ADD = 0x00000000;
internal const int NIM_MODIFY = 0x00000001;
internal const int NIM_DELETE = 0x00000002;

const int NIF_MESSAGE = 0x00000001;
const int NIF_ICON = 0x00000002;


internal struct NOTIFYICONDATA
{
internal int cbSize;
internal IntPtr hWnd;
internal uint uID;
internal uint uFlags;
internal uint uCallbackMessage;
internal IntPtr hIcon;
//internal char[] szTip = new char[64];
//internal IntPtr szTip;
}

[DllImport("coredll.dll")]
internal static extern int Shell_NotifyIcon(
int dwMessage, ref NOTIFYICONDATA pnid);

[DllImport("coredll.dll")]
internal static extern int SetForegroundWindow(IntPtr hWnd);

[DllImport("coredll.dll")]
internal static extern int ShowWindow(
IntPtr hWnd,
int nCmdShow);

[DllImport("coredll.dll")]
internal static extern IntPtr GetFocus();

#endregion


#region WindowSink

internal class WindowSink : Microsoft.WindowsCE.Forms.MessageWindow
{
//Private members
private int m_uID = 0;
private TrayIcon trayIcon;

//Constructor
public WindowSink(TrayIcon tIcon)
{
trayIcon = tIcon;
}

public int uID
{
set
{
m_uID = value;

}
}

protected override void WndProc(ref Microsoft.WindowsCE.Forms.Message msg)
{

if (msg.Msg == WM_NOTIFY_TRAY)
{
switch ((int)msg.LParam)
{
case WM_LBUTTONDOWN:
if ((int)msg.WParam == m_uID)
{
//If somebody hooked, raise the event
if (trayIcon.Click != null)
trayIcon.Click(trayIcon, null);

}
break;

case WM_RBUTTONUP:
{
MessageBox.Show("R Button Up");
}
break;
}
}

}
}
#endregion

}
}