Cross-Thread error but no threads!?

Question

Hey,
I have a UI with some buttons.  When you click a button it calls a webmethod and updates some information in my model.  Now.... i can click on this a number of times and its fine.... then sometimes for no reason at all i get a  "cross thread" error on my user control.  It appears at a random time.  I am not using threads!!  The only thing i can think of is that something is threading without me knowing?  I have a Ribbon bar and some buttons and that is it.  Im not even trying to update the UI once the button is pressed!  (only some info in the background).
anyone ever had anything like this?

Answer 1

You are assuming there is no valid explanation, so you don't provide much information to go on. You say "calls a webmethod"; that is likely highly relevant but we need more information about that.
 
Did you look at what the debugger says about the problem? Look at the location of the error; what was your program dong when it got ther error? What function was the program in? For questions such as this, please provide information such as that.
 
Also, did you add a line of code that causes the compiler to ignore cross-thread calls, so that a relevant compiler error message is not produced? If so, then please remove that line of code.