public void BindMenu(Menu mn,MenuItem menu,string mainMenu,string sql)

        {

                MenuItem mitem = null;

                DB db = new DB();

                DataSet ds = db.GetDataSet(sql, "table1");

                DataTable dTable = ds.Tables[];

                DataRow[] drow = dTable.Select(" parentId='" + mainMenu + "'");   

                foreach (DataRow dr in drow)

                {

                        mitem = new MenuItem();

                        mitem.Text = dr["modulName"].ToString();

                        mitem.Value = dr["modulId"].ToString();

                        mitem.NavigateUrl = "Default.aspx";

                        if (menu == null)

                        {

                                mn.Items.Add(mitem);

                        }

                        else

                        {

                                menu.ChildItems.Add(mitem);

                        }

                        DataSet dst = db.GetDataSet(sql, "table2");

                        DataTable dtb = dst.Tables[];

                        DataRow[] dar = dtb.Select(" parentId='" + mitem.Value + "'");

                        mainMenu = mitem.Value;

                        BindMenu(Menu1, mitem, mainMenu, sql);

                }

        }