asp 树，c# 查找 指定节点

using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
namespace WA.IBMS.FindTreeNode   //lxh 2008-9-16
{
    /// <summary>
    ///SelectTreeNode 的摘要说明
    /// </summary>
    public class SelectTreeNode
    {
        public SelectTreeNode()
        {
            //
            //TODO: 在此处添加构造函数逻辑
            //
        }
        /// <summary>
        /// 查找指定节点
        /// </summary>
        /// <param name="tnParent">节点</param>
        /// <param name="strValue">值</param>
        /// <returns></returns>
        public TreeNode Find_Node(TreeNode tnParent, string strValue)
        {
            TreeNode treeNode2 = new TreeNode();
            string venueCode = "";
            if (tnParent == null) return null;
            if (tnParent.Value == strValue) return tnParent;
   &