C# Definition:

private delegate IntPtr WndProc(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);

VB.NET Definition:

Private Delegate Function WndProc(ByVal hWnd As IntPtr, ByVal msg As UInteger, ByVal wParam As IntPtr, ByVal lParam As IntPtr) As IntPtr

User-Defined Types:

None.

Notes:

Check with WindowsMessages for a list of most (if not all) of the constants that will be passed in as messages to the WndProc method.