Ok,i've made a web service that do what i want,the problem is that i can see it only in local network. How can i made it work (like Apache in PHP) from anywhere in internet ? Thanks.

I've already try to set it as trasparent but it not work.

Thanks for the replays. The problem is this: I've made a software for save password,and i've insert in it a service "password recovery" thath send a mail with the password of the account (if the user have insert it).For this i'm using my gmail account. But i've try to send a mail to me (to another address, and so i've see that the user can see my mail address). How can i avoid the problem? If i have to create another mail account,can you advice me what service to use? (a free service that i can use with C# and i can block the replay). Thanks. Ps:sorry for bad english.