Stored procedure to return auto incremented number every time its called.

I'm looking to create a simple web service that will make a call to a ms sql server. The database should then return a number that is simply incremented by 1 each time its called.

Notice that I'm not doing any insert or update, I just want the database to return a auto incremented number every time the web service is called.

Can anyone provide the code for the stored procedure.

Thanks,

Samr