1     Private Sub BindTreeView()
 2         TreeView1.Nodes.AddRange(GetChildNodes(dt, 0))
 3     End Sub
 4 
 5     Private Function GetChildNodes(dt As DataTable, pId As Integer) As TreeNode()
 6         Dim nodes As New List(Of TreeNode)
 7         Dim rows = dt.AsEnumerable().Where(Function(s) CInt(s("pId")) = pId)
 8         For Each row In rows
 9             Dim node As New TreeNode()
10             node.Text = row("Name")
11             node.Tag = row("id")
12             node.Nodes.AddRange(GetChildNodes(dt, CInt(row("id"))))
13             nodes.Add(node)
14         Next
15         Return nodes.ToArray()
16     End Function

 1         private void BindTreeView()
 2         {
 3             treeView1.Nodes.AddRange(GetChildNodes(dt, 0));
 4         }
 5 
 6         private TreeNode[] GetChildNodes(DataTable dt, int pId)
 7         {
 8             var nodes = new List<TreeNode>();
 9             var rows = dt.AsEnumerable().Where(s => Convert.ToInt32(s["pId"]) == pId);
10             foreach(var row in rows)
11             {
12                 var node = new TreeNode();
13                 node.Text = row["Name"].ToString();
14                 node.Tag = row["Tag"].ToString();
15                 node.Nodes.AddRange(GetChildNodes(dt, Convert.ToInt32(row["Tag"])));
16                 nodes.Add(node);
17             }
18             return nodes.ToArray();
19         }