CheckedListBox与下拉框联动代码

  private void yewubind(string id)
        {
            //给业务类型下拉框绑定业务类型数据
            DataTable dtyewu = sb.SelectLast(id, 0);
            bool flag = false;
            foreach (Control con in panel1.Controls)
            {
                if (con.Name == id)
                {
                    con.Visible = true;
                    flag = true;
                    if (dtyewu.Rows.Count > 0)
                    {
                       
                    }
                    else
                    {
                        ((CheckedListBox)con).DataSource = null;
                    }
                }
                else
                {
                    con.Visible = false;
                }

            }
            if (!flag)
            {
                CheckedListBox clb_yewu = new CheckedListBox();
                clb_yewu.Name = id;
                clb_yewu.Visible = true;
                if (dtyewu.Rows.Count > 0)
                {
                    clb_yewu.DataSource = dtyewu;
                    clb_yewu.DisplayMember = "name";
                    clb_yewu.ValueMember = "id";
                }
                Size ss = new Size(200, 100);
                clb_yewu.Size = ss;
                panel1.Controls.Add(clb_yewu);

            }

        }
      
        private void cbb_jrh_SelectedIndexChanged(object sender, EventArgs e)
        {
            yewubind(cbb_jrh.SelectedValue.ToString());
          
        }

combobox联动　

            DataTable dtjrh = sb.SelectSyscode(2, true);
            if (dtjrh.Rows.Count > 0)
            {
                cbb_jrh.DataSource = dtjrh;
                cbb_jrh.DisplayMember = "name";
                cbb_jrh.ValueMember = "id";
                this.cbb_jrh.SelectedIndex = 0;
            }
            yewubind(cbb_jrh.SelectedValue.ToString());

　　

获取选中项　

   foreach (Control c in panel1.Controls)
                {
                    foreach (DataRowView dr in ((CheckedListBox)c).CheckedItems)
                    {
                        yewuid += dr["id"].ToString() + ";";
                    }
                }

　　最后清空

 panel1.Controls.Clear();
   this.cbb_jrh.SelectedIndex = 0;