When someone says "at the form level", where/what are they specifying? The person is talking about adding code to the form to create an autonumber.
I can only guess at what the person means, but I would suppose they are referring to having the form template determine forms' numbers as opposed to a web service or SQL server.
Hello,
If you want to give unique number for each form then go through the below link,
http://www.infopathdev.com/blogs/agni/archive/2006/05/15/Query-for-Items-in-SharePoint-Form-Library-Using-GetListItems-Web-Method.aspx