Q:

Creating a login system in C#. .mdf database?

So I've created a .mdf database in VS2010 following this tutorial: http://www.youtube.com/watch?v=INrcHZBhB20
What I failed to realize is he is using an .sdf database. I don't want to use .sdf so how could I continue with my current database? I know this is a bit much but I am completely clueless and I don't want to use .sdf because VS2010 doesn't let me create one (I get an error).
If you need more info, let me know. I just want to make it where you can create and sign in to accounts using the database.

A:

Enter SQL Server Express Management Studio and recreate your schema there. SQL Server Express creates .mdf databases.
Microsoft has a good tutorial here:
http://msdn.microsoft.com/en-us/library/ms186312(v=sql.105).aspx
You can most likely export your scripts for your database creation from visual studio and run them right in SQL Server Management Studio

