Using SQL server 2008 for ASP.net 2.0 Membership provider

[LayeseeUpdame]

I tried to set-up the SQL tables for ASP .net 2.0 membership provider by clicking on ASP.net Configuration under Project.I have completely uninstalled SQL 2005 Express and installed SQL 2008 Express instead.It seems like that it can not connect to the database. Does anybody know how to get this fixed so I can use 2008 instead ?