Unable to Make SQL Connection

Having Trouble making sql connection. this is my code

 private static SqlConnection GetConnection()
{
    SqlConnection con = new SqlConnection();
    con.ConnectionString = @"Data Source=.\SQLEXPRESS;Attach开发者_StackOverflow中文版DbFilename=" + path + @"\App_Data\Database1.sdf;Integrated Security=True;User Instance=True";
    con.Open();

    return con;
}

and this is what i get

Error: An attempt to attach an auto-named database for file \App_Data\Database1.sdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.

And my database is located in a folder App_Data so not sure whats wrong

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This might cover the issues you are facing...

msdn on sql express

Sorry for the link but I didn't want to just copy paste someone elses findings...