主题：[求助]动态目录树节点名不重复

Dim tr As WinForm.TreeView = e.Form.Controls("TreeView1")
Dim nd As WinForm.TreeNode
Dim dt As DataTable = DataTables("物料清单")

nd = tr.Nodes.Add("100","按零件编号分类")                    

For Each dr As DataRow In dt.Datarows                           

    nd.nodes.add("101",dr("零件编号"))                         

Next

子节点出来很多相同的节点名称，这怎么弄？我是想弄个按子节点筛选的。求教，多谢！