C#递归树

protected void Page_Load(object sender, EventArgs e) 
{ 
bindtree(PopId); 
} 
private void bindtree() 
{ 
TreeView1.Nodes.Clear(); 
AddTree(0, (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 
} 
} 
}