瞎写了个菜单效果，又不用了，还差很多东西，写着给自己看吧

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using Infragistics.WebUI.UltraWebNavigator;
using System.Text;

public partial class WebUserControl : System.Web.UI.UserControl
{
    private DataTable dtWhole;
    private DataTable dtWholeNew;
    private DataTable dtParent;
    public String s = "";
    private int menuLevel = 0;
    private StringBuilder sb = new StringBuilder();
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Getdatatable();
            CreateLevel();
            menuListInit();
            s = sb.ToString();
        }
    }
    /// <summary>
    /// 创建菜单等级
    /// </summary>
    private void CreateLevel()
    {
        DataColumn col = new DataColumn("Level", typeof(int));
        dtWhole.Columns.Add(col);
        dtWholeNew = dtWhole.Clone();
        foreach (DataRow dr in dtWhole.Rows)
        {
            menuLevel = 0;
            getBaseParent(dr["ID"].ToString());
            DataRow dr1;
            dr1 = dtWholeNew.NewRow();
            dr1["ID"] = dr["ID"];
            dr1["ParentID"] = dr["ParentID"];
            dr1["Name"] = dr["Name"];
            dr1["Level"] = menuLevel;
            dtWholeNew.Rows.Add(dr1);
        }
    }

    /// <summary>
    /// 得到等级
    /// </summary>
    /// <param name="ID">The ID.</param>
    /// <returns></returns>
    private int getBaseParent(string ID)
    {
        DataTable everyParentdt = Other.DataRowToDataTable(dtWhole.Select("ID='" + ID + "'"), dtWhole);

        if (everyParentdt.Rows[0]["ParentID"].ToString() == "0")
        {

        }
        else
        {
            getBaseParent(everyParentdt.Rows[0]["ParentID"].ToString());
            menuLevel++;
        }
        return menuLevel;
    }

    /// <summary>
    /// 创建菜单
    /// </summary>
    private void menuListInit()
    {
        dtParent = Other.DataRowToDataTable(dtWholeNew.Select("ParentID='0'"), dtWholeNew);
        InitTree(dtParent);
    }
    /// <summary>
    /// 创建菜单
    /// </summary>
    /// <param name="dt"></param>
    private void InitTree(DataTable dt)
    {
        if (dt == null)
        {
            return;
        }
        foreach (DataRow dr in dt.Rows)
        {
            DataTable childdt = Other.DataRowToDataTable(dtWholeNew.Select("ParentID='" + dr["ID"].ToString() + "'"), dtWholeNew);
            int paddingleft;

            string strimg = "<img src='" + Request.ApplicationPath + "/Images/arrow_g_rt.gif' id=img" + dr["ID"].ToString() + " onclick='MenuControl(\"div" + dr["ID"].ToString() + "@" + "\")'/>";

 

            if (childdt.Rows.Count != 0)
            {
                paddingleft = (Convert.ToInt32(dr["Level"]) + 1) * 20;
            }
            else
            {
                paddingleft = (Convert.ToInt32(dr["Level"]) + 1) * 20 + 9;
                strimg = "";
            }

            string strDivStart = "<div id='div" + dr["ID"].ToString() + "' style='padding-left:" + paddingleft.ToString() + "px'>";
            string strCheckbox = "<input id='Checkbox" + dr["ID"].ToString() + "' type='checkbox' style='width:30px' />";
            string strText = "<input id='Text" + dr["ID"].ToString() + "' name='Text" + dr["ID"].ToString() + "' type='text' value='" + dr["Name"].ToString() + "' />";
            string strDivEnd = "</div>";
            sb.Append(strDivStart);
            sb.Append(strimg);
            sb.Append(strCheckbox);
            sb.Append(strText);
            sb.Append(strDivEnd);
            InitTree(childdt);
        }
    }

    void Getdatatable()
    {
        dtWhole = new DataTable();
        dtWhole.Columns.Add("ID", typeof(String));
        dtWhole.Columns.Add("ParentID", typeof(String));
        dtWhole.Columns.Add("Name", typeof(String));
        DataRow dr;

 

        dr = dtWhole.NewRow();
        dr["ID"] = 1;
        dr["ParentID"] = 0;
        dr["Name"] = "Name" + 1;
        dtWhole.Rows.Add(dr);

        dr = dtWhole.NewRow();
        dr["ID"] = 2;
        dr["ParentID"] = 1;
        dr["Name"] = "Name" + 2;
        dtWhole.Rows.Add(dr);

        dr = dtWhole.NewRow();
        dr["ID"] = 3;
        dr["ParentID"] = 1;
        dr["Name"] = "Name" + 3;
        dtWhole.Rows.Add(dr);

        dr = dtWhole.NewRow();
        dr["ID"] = 4;
        dr["ParentID"] = 0;
        dr["Name"] = "Name" + 4;
        dtWhole.Rows.Add(dr);

        dr = dtWhole.NewRow();
        dr["ID"] = 5;
        dr["ParentID"] = 4;
        dr["Name"] = "Name" + 5;
        dtWhole.Rows.Add(dr);

        dr = dtWhole.NewRow();
        dr["ID"] = 6;
        dr["ParentID"] = 4;
        dr["Name"] = "Name" + 6;
        dtWhole.Rows.Add(dr);

 

        dr = dtWhole.NewRow();
        dr["ID"] = 7;
        dr["ParentID"] = 0;
        dr["Name"] = "Name" + 7;
        dtWhole.Rows.Add(dr);

        dr = dtWhole.NewRow();
        dr["ID"] = 8;
        dr["ParentID"] = 7;
        dr["Name"] = "Name" + 8;
        dtWhole.Rows.Add(dr);

        dr = dtWhole.NewRow();
        dr["ID"] = 9;
        dr["ParentID"] = 7;
        dr["Name"] = "Name" + 9;
        dtWhole.Rows.Add(dr);

        dr = dtWhole.NewRow();
        dr["ID"] = 10;
        dr["ParentID"] = 9;
        dr["Name"] = "Name" + 10;
        dtWhole.Rows.Add(dr);

    }
}