搞定了,
Private Sub TreeView1_indexChanged(ByVal sender As Object, ByVal e As Microsoft.Web.UI.WebControls.TreeViewSelectEventArgs) Handles TreeView1.SelectedIndexChange
Dim a As Integer
a = TreeView1.SelectedNodeIndex
TextBox1.Text = CStr(a)
End Sub
但是AutoPostBack设置为True的话,TreeView还要刷新,闪烁,我的TreeView比较庞大,这可怎么办???苦恼中。。。