InfoPath Dev

Hello, I want to create a form connected to an Access Database. I need that each form has a "ID progressive number", I mean something like 0001, 0002, 0003... I wouldn't use a counter in the access table because if I delete a row I lose that number and so I risk to have 0001, 0003,0006... Much better it would be to have a number ...

Hello, first, sorry for my English! second, my situation: I'm just starting to use Infopath, for years I've been using Access and VBA but I'm not a developer and I cannot understand how to work in Visual Studio Tools using vb code. third, my question: What I would like to do: I don't use Sharepoint, I want to save a fulfilled ...