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Inserting into sql server .mdf file does not work

using (SqlConnection sqlConnection = new SqlConnection(@"Data Source=.SQLE;AttachDbFilename=|DataDirectory|DB.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True"))

        {

            SqlCommand sqlcommand =

                new SqlCommand("INSERT INTO [Streets] ([name], [highway]) VALUES ('sdsgsdg', 'sdfdsgsdg');",

                               sqlConnection);

            sqlcommand.Connection.Open();

 

            MessageBox.Show(sqlcommand.ExecuteNonQuery().ToString());

            sqlcommand.Connection.Close();

        }