无限极分类装入Treeview

Declare @Id Int
Set @Id = 0; ---在此修改父节点

With RootNodeCTE(NodeId,ParentId,[text],orderid)
As
(
Select NodeId,ParentId,[text],orderid From S_Tree Where ParentId In (@Id)
Union All
Select S_Tree.NodeId,S_Tree.ParentId,S_Tree.[text],s_tree.orderid From RootNodeCTE
Inner Join S_Tree
On RootNodeCTE.NodeId = S_Tree.ParentId
)

Select * From RootNodeCTE order by ParentId,NODEID asc

private void btnTreeView_Click(object sender, EventArgs e)
{
string xmlFile = @"E:\XML_F.xml";
DataSet ds = new DataSet();
ds.ReadXml(xmlFile);
DataTable dt = ds.Tables[0];
DataRow[] drss = dt.Select("ParentId = '38'");

string parentId = "0";
TreeNode treeNodeParent = new TreeNode("DataItems");
treeView1.Nodes.Add(treeNodeParent);
GenerateTree(parentId, dt, treeNodeParent);
treeView1.ExpandAll();
}

/// <summary>
///
/// </summary>
private void GenerateTree(string parentId, DataTable dt, TreeNode treeNodeParent)
{
string strWhere = " ParentId = '" + parentId + "'";
DataRow[] drs = dt.Select(strWhere);
if (drs.Length > 0)
{
foreach (DataRow dr in drs)
{
parentId =dr[0].ToString();
TreeNode treeNode = new TreeNode();
treeNode.Tag = dr[0].ToString();
treeNode.Text = dr[2].ToString() + "[" + dr[0].ToString() + "]";
treeNodeParent.Nodes.Add(treeNode);

GenerateTree(parentId, dt, treeNode);
}
}
}