proxy problem

[Bsbosa.com]

I have a project in c# Windows Form
My program is working on the internet

and on my computer program working without problem.
but when user try to program they are getting proxy error.

Because my proxy and user proxy differnt.
and What should I do? http://forum.bsbosa.com/script/Forums/Images/smiley_confused.gif

and I'm sorry. My English not good.