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;