How to generate unique order number?

Question

I\'m looking for a good way to generate a unique order ID. Can you see any problems with the code below?

int customerId = 10000000;

long ticks = DateTime.UtcNow         


        

Answer 1

What about having an IDENTITY field in the database do it for you?

It will also have the advantage that deleted/canceled order numbers won't be reused (which is good or may even be required for accounting).