Visual Studio :: Use Database File From SQL Server 2005 Installed In App Data Directory?

I am just learning application development and my question is so I can demo a project from an Internship for a class at school. I am planning on using Visual Studio 2010 in debug mode for the presentation.

Here it goes:

I created a database utilizing SQL server 2005. I want to take the .mdf file from SQL Server and place it in the App data directory of my application. I am hoping that I do not need to rebuild any datasets that I am currently utilizing. I am utilizing several stored procedures that are in the database, these stored procedure are access utilizing my datasets.

I was able to place the file in the application but I get an exception whenever I try to utilize a stored procedure that was created in the database.

Here is the error: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)

I verified all of my datasets utilize the following connection:

<add name="DerrickConnectionString" connectionString="Data Source=.SQLEXPRESS;AttachDbFilename="|DataDirectory|Derrick.mdf";Integrated Security=True; Connect Timeout=30;User Instance=True "
providerName="System.Data.SqlClient" />

Get methods that I built with the query builder in VS work but stored procedures do not.