combobox联动

 

 private void w_day_scheduling_Load(object sender, EventArgs e)
        {
           
            if (ls_deptname == string.Empty)
            {
                ds = DoctorService.getDdept();
                comboBoxEx1.DataSource = ds.Tables[0];
                comboBoxEx1.DisplayMember = "group_name";
                comboBoxEx1.SelectedIndex = 0;
                comboBoxEx1.ValueMember = "group_code";
                ds.Dispose();
            }
        }

 private void comboBoxEx1_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (comboBoxEx1.SelectedIndex > -1)
            {
                DataRowView drv = (DataRowView)comboBoxEx1.SelectedItem;
                string  ls_deptcode = drv.Row["group_code"].ToString();
                ds = DoctorService.getNoClass(ls_deptcode);
                comboBoxEx2.DataSource = ds.Tables[0];
                comboBoxEx2.DisplayMember = "CLINIC_LABEL";
            }
        }