WinForm TreeView Node Selection

 Public Partial classForm1:form { PublicForm1 () {InitializeComponent (); }        stringTag ="True";        StringBuilder Nodestag; /// <summary>        ///Select All/// </summary>        /// <param name= "TreeNode" ></param>        /// <param name= "nodechecked" ></param>        Private voidCheckallchildnodes (TreeNode TreeNode,BOOLnodechecked) {            foreach(TreeNode nodeinchtreenode.nodes) {node. Checked=nodechecked; Node. Tag= tag;////Remember to set the Tag property for the selected item here                if(node. Nodes.count >0)                {                     This.                Checkallchildnodes (node, nodechecked); }            }        }        Private voidTraversnodes (TreeNode parent) {TreeNode node=parent; if(Node! =NULL)            {                if(node. Tag! =NULL&& node. tag.tostring () = =tag) Nodestag.appendformat ("node:{0} has checked\n", node.                Text); if(node. Firstnode! =NULL)////If node nodes have child nodes then go to traverse{traversnodes (node.                Firstnode); }                if(node. NextNode! =NULL)////If there is a sibling node behind the node, go to traverse{traversnodes (node.                NextNode); }            }        }        /// <summary>        ///Checked or Unchecked box event occurred/// </summary>        /// <param name= "Sender" ></param>        /// <param name= "E" ></param>        Private voidTreeview1_aftercheck (Objectsender, TreeViewEventArgs e) {            if(E.action! =treeviewaction.unknown) {TreeNode node=E.node; if(node. Tag = =NULL) node. Tag= tag;//Additional node Information                Elsenode. Tag=NULL;                Checkallchildnodes (E.node, e.node.checked); //Select parent Node                BOOLBol =true; if(E.node.parent! =NULL)                {                     for(inti =0; i < E.node.parent.nodes.count; i++)                    {                        if(!E.node.parent.nodes[i]. Checked) Bol=false; } e.node.parent.checked=Bol; ///Remember to set its tag if the parent node is selected or canceled                    if(BOL) {E.node.parent.tag=tag; }                    Else{E.node.parent.tag=NULL; }                }            }        }    }

WinForm TreeView Node Selection