Code
/// <summary>
    /// 绑定父级部门下拉菜单
    /// </summary>
    private void bindFatherDepartment()
    {
        DataTable dt = creatDepartmentTable();
        ddlFatherDepartment.DataSource = dt;
        ddlFatherDepartment.DataTextField = "DepartmentName";
        ddlFatherDepartment.DataValueField = "DepartmentID";
        ddlFatherDepartment.DataBind();
        ddlFatherDepartment.Items.Insert(0, "请选择……");
        dt.Dispose();
    }
    /// <summary>
    /// 构造作为数据源的datatable
    /// </summary>
    /// <returns></returns>
    private DataTable creatDepartmentTable()
    {
        DepartmentsDS.DepartmentsDataTable result = new DepartmentsDS.DepartmentsDataTable();

        DataSet DS = DBiz.getOrganizationList();
        DataTable DT = DS.Tables[0];
        for (int i = 0; i < DT.Rows.Count; i++)
        {
            result.Rows.Add(DT.Rows[i].ItemArray);
            creatFatherDepartmentTable1(result, DT.Rows[i]["DepartmentID"].ToString());
        }
        DT.Dispose();
        DS.Dispose();
        return result;
    }
    /// <summary>
    /// 添加带线的数据行
    /// </summary>
    /// <param name="target"></param>
    /// <param name="ID"></param>
    private void creatFatherDepartmentTable1(DataTable target,string ID)
    {
        DataSet DStemp = DBiz.getChildListByID(ID);
        DataTable DTtemp = DStemp.Tables[0];
        for (int i = 0; i < DTtemp.Rows.Count; i++)
        {
            DataRow DR = DTtemp.Rows[i];

            //构造DR内容
            DataRow tempDR = DR;
            DataRow fatherDR = DBiz.getByID(tempDR["DepartmentSuperiorID"].ToString()).Tables[0].Rows[0];
            for (int j = 0; j < (DR["DepartmentGUID"].ToString().Length/5 -1); j++)
            {
                if (j == 0)
                {
                    if (Convert.ToInt32(tempDR["DepartmentOrder"]) < Convert.ToInt32(fatherDR["DepartmentCount"]))
                    {
                        DR["DepartmentName"] = "├　" +DR["DepartmentName"];
                    }
                    else
                    {
                        DR["DepartmentName"] = "└　" + DR["DepartmentName"];
                    }
                }
                else
                {
                    if (Convert.ToInt32(tempDR["DepartmentOrder"]) < Convert.ToInt32(fatherDR["DepartmentCount"]))
                    {
                        DR["DepartmentName"] = "│　" + DR["DepartmentName"];
                    }
                    else
                    {
                        DR["DepartmentName"] = "　　" + DR["DepartmentName"];
                    }
                }
                if (fatherDR["DepartmentSuperiorID"]== DBNull.Value)
                {
                    break;
                }
                tempDR = fatherDR;

                fatherDR = DBiz.getByID(fatherDR["DepartmentSuperiorID"].ToString()).Tables[0].Rows[0];
            }
            target.Rows.Add(DR.ItemArray);
            creatFatherDepartmentTable1(target, DR["DepartmentID"].ToString());
        }
        DStemp.Dispose();
    }