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());

        }

            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());

   foreach (Control c in panel1.Controls)

                {

                    foreach (DataRowView dr in ((CheckedListBox)c).CheckedItems)

                    {

                        yewuid += dr["id"].ToString() + ";";

                    }

                }

 panel1.Controls.Clear();

   this.cbb_jrh.SelectedIndex = 0;