/// <summary>
        /// 设置查找的节点为选定节点
        /// 涂聚文
        /// 2013-07-15
        /// </summary>
        /// <param name="trvToSrch"></param>
        /// <param name="strToSrch"></param>
        /// <returns></returns>
        public TreeNode srchTxtInSelectTreeView(TreeView trvToSrch, String strToSrch)
        {
            // check if the treeView is not NULL 
            if (trvToSrch == null)
                return null;

            // loop through the nodes in the treeview's root nodes 
            for (int i = 0; i < trvToSrch.Nodes.Count; i++)
            {
                TreeNode trvNode = srchTxtInSelectTreeViewNode(trvToSrch.Nodes[i], strToSrch);
                if (trvNode != null)
                    return trvNode;
            }
            return null;
        }
        /// <summary>
        /// 查找节点
        /// </summary>
        /// <param name="trvNode"></param>
        /// <param name="strToSrch"></param>
        /// <returns></returns>
        public TreeNode srchTxtInSelectTreeViewNode(TreeNode trvNode, String strToSrch)
        {
            // check if the treeView is not NULL 
            if (trvNode == null)
                return null;

            if (trvNode.Text == strToSrch)
                return trvNode;

            // loop through the nodes in the treeview's sub nodes 
            for (int i = 0; i < trvNode.Nodes.Count; i++)
            {
                // recursive call to itself to check lower level nodes 
                TreeNode retTrvNode = srchTxtInSelectTreeViewNode(trvNode.Nodes[i], strToSrch);
                if (retTrvNode != null)
                    return retTrvNode;
            }
            return null;
        } 

                //TreeView初始化设置默认选择节点
                treeView1.SelectedNode = srchTxtInSelectTreeView(treeView1, "深圳");