how to bind combobox with datatable in c#

con.Open();
            cmd = new OleDbCommand("Select DISTINCT departmentName from Department", con);
            OleDbDataAdapter da = new OleDbDataAdapter(cmd);
            DataTable dt = new DataTable();
            da.Fill(dt);
            comboBoxDepartment.DisplayMember = "departmentName";
            comboBoxDepartment.ValueMember = "departmentName";
            comboBoxDepartment.DataSource = dt;
            con.Close();