I need help in generating the Unique Number of 4 character length.
Criteria is as follows :
- String will always start with alphabet
- Another 3 characters will be a combination of alphabets (A-Z) and digits (0-9)
- Once the number generated it could not be repeat
A001, A999, ZD01, DA9P, SXS8 etc...
I need to write a logic for the same in my ASP.NET (VB.NET) based web application.
Please provide a direction.