How to design a VB.net form for creating an unique user ID.

For better understanding  of vb.net code or database related inquiry the book written by Mike Murach is very good book which is available on amazon with free shipping charge, I will suggest one can  refer.
For creating an unique user id.Take following steps ;
1. Create a data table like following columns in ms access. naming "UserAccount"
     (i)   s.no                             -     number
     (ii)  Userid                         -    text           - make it primary key
     (iii) password                    -     text
      (iv) Remarks                    -     text
and else whatever details we want to take from the persons