Please let me know where I am wrong

Here binding data with datagridview control in C#

SqlConnection con =        new SqlConnection("server=****\\sqlexpress; uid=sa; password=sa;         database=****");     
                                   con.Open();
                                   SqlDataAdapter ada =        new SqlDataAdapter("select * from tableName", con);
                                   DataTable dt =        new DataTable();
                                   ada.Fill(dt);
                                   dataGridView1.DataSource = adaa;