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I'm experimenting in connecting a C# app to an MDF database for the first time, and I need a little help .. I made a small MDF database file in Visual Studio 2010, then created another project and imported the file into the project itself. I am not trying to connect to the MDF file via code. Here the code I'm using: namespace DBtestApp1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } System.Data.SqlClient.SqlConnection con; private void Form1_Load(object sender, EventArgs e) { con = new System.Data.SqlClient.SqlConnection(); con.ConnectionString = "DataSource=.\\SQLEXPRESS; AttachDbFilename =SampleDatabase.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True"; con.Open(); MessageBox.Show("Connection opened"); con.Close(); MessageBox.Show("Connection closed"); } } } When I run the application, I get an exception at the line where I define the connection string, and the exception has this message at the top of the stack: System.ArgumentException: Keyword not supported: 'datasource'. Can someone point me in the right direction ?

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