Csharp: Treeview check list value

 /// <summary>
        /// 選擇的節點
        /// 塗聚文 20121116
        /// 捷為工作室
        /// 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void treeView1_AfterCheck(object sender, TreeViewEventArgs e)
        {
 #region  4

            if (e.Action != TreeViewAction.Unknown)
            {

                //Event call by mouse or key-press

                SetNodeCheckStatus(e.Node, e.Node.Checked);

            }
            #endregion 


        }
        /// <summary>
        /// 選擇的節點
        /// </summary>
        /// <param name="tn"></param>
        /// <param name="Checked"></param>
        private void SetNodeCheckStatus(TreeNode tn, bool Checked)
        {

            if (tn == null) return;

            // Check children nodes

            foreach (TreeNode tnChild in tn.Nodes)
            {

                tnChild.Checked = Checked;

                SetNodeCheckStatus(tnChild, Checked);

            }

            // Set parent check status

            TreeNode tnParent = tn;

            int nNodeCount = 0;

            while (tnParent.Parent != null)
            {

                tnParent = (TreeNode)(tnParent.Parent);

                nNodeCount = 0;

                foreach (TreeNode tnTemp in tnParent.Nodes)

                    if (tnTemp.Checked == Checked)

                        nNodeCount++;

                if (nNodeCount == tnParent.Nodes.Count)

                    tnParent.Checked = Checked;

                else

                    tnParent.Checked = false;

            }

        }


        #region  選擇的節點
        /// <summary>
        /// http://www.codeproject.com/Questions/196856/C-NET-Treeview-Node-Checked
        /// http://msdn.microsoft.com/en-us/library/system.windows.forms.treeview.aftercheck.aspx
        /// </summary>
        /// <param name="treeNode"></param>
        /// <param name="nodeChecked"></param>
        public void CheckAllChildNodes(TreeNode treeNode, bool nodeChecked)
        {
            foreach (TreeNode node in treeNode.Nodes)
            {
                node.Checked = nodeChecked;
                if (node.Nodes.Count > 0)
                {
                    this.CheckAllChildNodes(node, nodeChecked);
                }
            }
        }
        #endregion
        /// <summary>
        /// 顯示選擇的節點
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {

            DataTable dt = new DataTable();
            dt.Columns.Add("Uid", typeof(Guid));
            dt.Columns.Add("ID", typeof(int));
            dt.Columns.Add("Name", typeof(string));
            dt.Columns.Add("ParentID", typeof(int));

            List<TreeNode> selectedNodes = new List<TreeNode>();
            GetSelectedTreeNode(treeView1.Nodes, selectedNodes);
            int i = 0;
            foreach (TreeNode node in selectedNodes)
            {
                 if (!string.IsNullOrEmpty(node.ToolTipText))
                {
                    dt.Rows.Add(new Guid(node.ToolTipText), node.Name, node.Text,node.Parent.Name);
                }
                i++;
            }


            dataGridView1.DataSource = dt;
            
            

           
           
        }
        /// <summary>
        /// 選擇的節點的值
        /// </summary>
        /// <param name="nodes"></param>
        /// <param name="selectedNodes"></param>
        void GetSelectedTreeNode(TreeNodeCollection nodes, List<TreeNode> selectedNodes)
        {
            foreach (TreeNode node in nodes)
            {
                if (node.Checked)
                {
                    selectedNodes.Add(node);
                }
                GetSelectedTreeNode(node.Nodes, selectedNodes);
            }
        }