Using external database for setting roles??

Question

Hi guys and girls! Im kinda new to C# and asp.net, so bare with me :).

So I just learned how to set up my own login using my external database and now I want to set up 3 diffrent roles for the users (admin, employee and customer). 

The only way I know how right now is to use the web administration tool, and setting it up with the local db that it creates. But since I want to connect my userid in my login table  with another table I need the login and roles function to be located externally aswell. 


Been searching all over the internet for a solution, but cant seem to find what im looking for. Any suggestions or am I too fuzzy? 




Btw cheers for the great work everyone, this site have helped me alot! :)

//Love from sweden