How to reset identity column in MS Access

Question

I have a windows application connected with MS Access 2007 database

It had more than 300 records in Customer Table.

I have deleted

Answer 1

If you really must reset the autonumber, and you should first consider @Eugene Rieck's answer, you can compact and repair the database, which is something you should be doing with a back-end database on a fairly regular basis, anyway.