How to Fill ComboBox From Database in C#

  s = "select * from tablename ";
           MySqlDataAdapter da = new MySqlDataAdapter(s, getcon());
            DataTable dt = new DataTable();
            da.Fill(dt);
            cmb_serchcategorie.DataSource = dt;
            cmb_serchcategorie.ValueMember = "ID";
            cmb_serchcategorie.DisplayMember = "ColumnName";