Question

I need to generate 8 digit unique id in c#. On my site a user will register and I need to generate a unique id for him in c# code(I don’t want this logic in DB), after inserting the id I need to save it in database.

Edit: I need that numbers to be generated in random manner everytime.

Answer 1

Although not 8 digits, I’d use a GUID for that purpose:

var id = Guid.NewGuid().ToString()

From Wikipedia:

Ideally, a GUID will never be
generated twice by any computer or
group of computers in existence. The
total number of unique keys (2^128 or
3.4×10^38 – in relation there are about 1.33×10^50 atoms on earth) is so large that the probability of the same
number being generated twice is
extremely small, and certain
techniques have been developed to help
ensure that numbers are not duplicated