Create user is creating aspxxxx.mdf database in my app_data folder

I had already setup roles for my pages and requirements call for ability to manage and create users.
So i was looking at code that allows you to do so using membership, even though i got the page to work, it was creating a database in my app_data folder.. i already have SQLExpress setup with the asp schema, but cant figure out how to get my application to use that instead of creating the db in the folder?
What am i missing or doing wrong?
I have the following setup in my web.config file..
<authentication mode="Windows"/> <authorization> <deny users="?"/> </authorization> <membership> <providers> <add name="SqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" connectionStringName="connect ...