STAThread missing, but it is there

Question

Here is the error message that I am recieving when I try to open an OpenFileDialog in my program:

\"Current thread must be set to single thread apar

Answer 1

Try setting breakpoints at the main procedure, the point where the dialogbox is created, and where it is used. Then look at what thread(s) you actually are in. Also, check what the value of Thread.CurrentThread.GetApartmentState() is at those points.