public MOUSE_EVENT_RECORD MouseEvent;

    public struct MOUSE_EVENT_RECORD

        public MOUSE_EVENT_RECORD MouseEvent;

    <FieldOffset(4)> Public MouseEvent As MOUSE_EVENT_RECORD

• MOUSE_EVENT_RECORD
The MOUSE_EVENT_RECORD structure is used in a console INPUT_RECORD structure to report mouse input events.
7/17/2015 10:26:59 AM - -208.38.35.2

    public struct MOUSE_EVENT_RECORD

    Public Structure MOUSE_EVENT_RECORD

This started working once I changed the FOCUS_EVENT_RECORD to take a uint rather than a bool. Prior to that MOUSE_EVENT_RECORD.dwMousePosition.X was always 0