Thanks but No... I think what you are doing here is creating a .NET executable (.EXE) that can use the MP COM object (Mappoint Control 11.0). What I am looking for is a way to create a .NET DLL that can be used inside MP as a COM addin. This article on MSDN ( http://msdn.microsoft.com/library/en...asp?frame=true ) shows clearly how to make a COM add-in for MapPoint using vb 6.0. I have tried to do something similar to this in .NET by exposing the same function (AddinInstance_OnConnection, etc) but MP wont recognize my DLL as a valid office add-in. I'm surprise that nobody has done this.