C# Definition:

　[StructLayout(LayoutKind.Sequential)]

struct COPYDATASTRUCT {
    public IntPtr dwData;
    public int cbData;
    public IntPtr lpData;
}

VB Definition:

Structure COPYDATASTRUCT
   Public dwData As IntPtr
   Public cdData As Int32
   Public lpData As IntPtr
End Structure

User-Defined Field Types:

None.