递归实现tree

表结构：ID(int)，ParentID(int), ConText(varchar(50)), depth(varchar(100)),image(varchar(100)), eimage(varcahr(100)),
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  // 递归添加树的节点
  public void AddTree(int ParentID,TreeNode pNode)
  {
   DataSet ds=(DataSet) this.ViewState["ds"];
   DataView dvTree = new DataView(ds.Tables[0]);
   //过滤ParentID,得到当前的所有子节点
   dvTree.RowFilter =  "[PARENTID] = " + ParentID;

   foreach(DataRowView Row in dvTree)
   {
    TreeNode Node=new TreeNode() ;
    if(pNode == null)
    {    //'?添加根节点
     TreeView1.Nodes.Add(Node);
     Node.Expanded = true;
    }
    else
    {   //添加当前节点的子节点
     pNode.Nodes.Add(Node);
     Node.Expanded = false;
    }

    Node.Text = Row["ConText"].ToString();
    AddTree(Int32.Parse(Row["ID"].ToString()), Node);//递归
    Node.Target = "main";
    Node.NavigateUrl = Row["depth"].ToString();
    Node.ImageUrl = Row["image"].ToString() ;
    Node.ExpandedImageUrl = Row["eimage"].ToString();
   }                  
  }