C# Signature:

[DllImport("shell32.dll")]
static extern bool Shell_NotifyIcon(uint dwMessage,
   [In] ref NOTIFYICONDATA pnid);

VB.NET Signature

<DllImport("shell32.dll")> _
Shared Function Shell_NotifyIcon(dwMessage as UInteger, ByRef pnid as NOTIFYICONDATA) as Boolean
End Function

User-Defined Types:

Here's the data structure for the NotifyIconData block, contributed by staff at http://www.softswift.com

    [StructLayout(LayoutKind.Sequential)]
    public struct NotifyIconData
    {
        public System.Int32 cbSize; // DWORD
        public System.IntPtr hWnd; // HWND
        public System.Int32 uID; // UINT
        public NotifyFlags uFlags; // UINT
        public System.Int32 uCallbackMessage; // UINT
        public System.IntPtr hIcon; // HICON
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst=128)]
        public System.String szTip; // char[128]
        public System.Int32 dwState; // DWORD
        public System.Int32 dwStateMask; // DWORD
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst=256)]
        public System.String szInfo; // char[256]
        public System.Int32 uTimeoutOrVersion; // UINT
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst=64)]
        public System.String szInfoTitle; // char[64]
        public System.Int32 dwInfoFlags; // DWORD
        //GUID guidItem; > IE 6
    }

And then we noticed that the data structure is already provided elsewhere on this site but without a reference so here's the reference http://www.pinvoke.net/default.aspx/Structures.NOTIFYICONDATA

    public enum NotifyIconMessage : int
    {
        NIM_ADD      = 0x00000000,
        NIM_MODIFY       = 0x00000001,
        NIM_DELETE       = 0x00000002,
        NIM_SETFOCUS     = 0x00000003,
        NIM_SETVERSION   = 0x00000004,
    }

Notes:

Returns TRUE if successful, or FALSE otherwise. If dwMessage is set to NIM_SETVERSION, the function returns TRUE if the version was successfully changed, or FALSE if the requested version is not supported

Tips & Tricks:

Please add some!

Sample Code:

Please add some!

Alternative Managed API:

System.Windows.Forms.NotifyIcon

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