Sql connection can not open why?

Question

I use the following source code to connect sql database, but the connection can not open, can somebody help me? thanks.
SqlCeConnection con = new SqlCeConnection("Data Source="
                + System.IO.Path.Combine(System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetEntryAssembly().Location), "Sampledatabase.mdf"));
            con.Open();
OR
SqlCeConnection con = new SqlCeConnection(@"Data Source=|DataDirectory|\Sampledatabase.mdf");
con.Open();

Answer 1

Hi Sunny,
Based on your code, your case related to how to connect to an MDF database file?
The keypoint is how to write the connectionstring.
Here is a sample,
con.ConnectionString = @"Data Source=.\SQLEXPRESS;
AttachDbFilename=c:\folder\SampleDatabase.mdf;
Integrated Security=True;
Connect Timeout=30;
User Instance=True";
From your second code with DataDirectory
Note the filepath should have |DataDirectory| which actually links to "current project directory\App_Data\" or "current project directory" and get the .mdf file.
Best reagrds,
Kristin
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