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Vb.NET Threads and global variables

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8.8
I have a globally defined variable (interface?) to my database in ApplicationEvents.vb. (public DB as TransDB)

On startup (MyApplication_Startup) it creates a new instance of the interface, and connects to the database.

then, in the rest of my program i can read/write by using
My.Application.DB.ReadFromDB(<args>)
My.Application.DB.WriteToDB(<args>)
etc.

This works through all my code, except inside a thread.

The thread is for printing and what it does is
1) show a form to allow the user to select the documents to be printed
2) extracts an embedded excel file
3) starts excel and maps data from either a) a form the user has modified, or b) from a saved entry in the database
4) prints the specified documents

inside the thread My.Application.DB is 'Nothing' and the program crashes.

why?  

How can I access this so I don't have to create a 2nd connection?

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Author Comment by sgaggerj:

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