C#递归树

 protected void Page_Load(object sender, EventArgs e)
 {
 bindtree(PopId);
 }
 private void bindtree()
 {
 TreeView1.Nodes.Clear();
 AddTree(, (TreeNode)null);
 }
 public void AddTree(int ParentID, TreeNode pNode)
 {
 DataTable dt = new DataTable();
 //数据源
 dt = logbll.BindPop();
 DataView dvTree = new DataView(dt);
 //过滤ParentID,得到当前的所有子节点
 dvTree.RowFilter = "flid = " + ParentID; 

 foreach (DataRowView Row in dvTree)
 {
 TreeNode Node = new TreeNode();
 if (pNode == null)
 { //添加根节点
 Node.Text = Row["PopName"].ToString();
 TreeView1.Nodes.Add(Node);
 //Node.Expanded = true; 

 AddTree(Int32.Parse(Row["PopId"].ToString()), Node); //再次递归
 }
 else
 { //添加当前节点的子节点
 Node.Text = Row["PopName"].ToString();
 Node.NavigateUrl = Row["PostUrl"].ToString();
 pNode.ChildNodes.Add(Node);
 //Node.Expanded = true;
 AddTree(Int32.Parse(Row["PopId"].ToString()), Node); //再次递归
 }
 }
 }