VB.net form application closes Inventor when shutting down

[BromanSillito]

I have written a program in VB.net with Inventor API functionality and have been developing it for some time now.  Recently when closing the VB.net application it also closes Inventor. Here's the call I use to close the VB.net application:

System.Windows.Forms.Application.Exit()

Can anyone tell me why it would close Inventor?  Do I need to release the Inventor.Application object in the closing function of my form?

[yan.gauthier]

when you close a form, it try to close it's thread at the same time. since your form is declared on the Inventor thread, it closes Inventor.

How do you start your form ?

[BromanSillito]

I don't believe that the form is loaded on an Inventor thread.  My program is a standard winform application, and is loaded before any Inventor threads. I have not touched the form designer file or the resx file.  I make the connection to Inventor using: "oInventorApp = Interaction.GetObject(, "Inventor.Application")", and it is made after the form is loaded.

[yan.gauthier]

My guess would be that on closing your application, the code Dispose of you InvApp object. you should be able to debug your code and follow the closing event steps