Prevent duplicates entries in TreeView

Hello Guy,

Once more I need help with TreeView control. :rolleyes: I need a way to check for duplicates value in the tree before saving edited node. I wrote some code but for some reason it’s only get the root of the treeview and not the child nodes.

Code:

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Private Sub TreeView1_AfterLabelEdit1(ByVal sender As System.Object, ByVal e As System.Windows.Forms.NodeLabelEditEventArgs) Handles TreeView1.AfterLabelEdit

Dim node As TreeNode

        If Not (e.Label Is Nothing) Then
            If e.Label.Length > 0 Then
                If e.Label.IndexOfAny(New Char() {"@"c, "."c, ","c, "!"c}) = -1 Then
                    ' Stop editing without canceling the label change.
                    'TreeView1.MousePosition)

                    For Each node In TreeView1.Nodes
                        If node.ToString = e.Label.ToString Then
                            e.CancelEdit = True
                        Else
                            e.Node.EndEdit(False)
                        End If
                    Next

                End If
            End If
        End If

End Sub

---

Please help :confused:

Thank you.

Try this:

VB Code:

Private Sub TreeView_AfterLabelEdit(ByVal sender As Object, ByVal e As System.Windows.Forms.NodeLabelEditEventArgs) Handles TreeView.AfterLabelEdit
        If e.Label = Nothing Or e.Label.IndexOfAny(New Char() {"@"c, "."c, ","c, "!"c}) <> -1 Then
            e.CancelEdit = True
            Exit Sub
        End If
        Dim Tn As TreeNode
        For Each Tn In rf.Nodes
            If Tn.Text = e.Label Then
                e.CancelEdit = True
                Exit For
            End If
        Next
    End Sub