How to keep the user from leaving a node in edit mode until they have entered a valid node name in WinForms TreeViewAdv?

private void treeViewAdv1_NodeEditorValidating_1(object sender, TreeNodeAdvCancelableEditEventArgs e)
{
    if (e.Label == "Syncfusion")
    {
        e.Cancel = false;
        MessageBox.Show("Valid");
        e.ContinueEditing = false;
    }
    else
    {
        // Cancel the label edit action, inform the user, and place the node in edit mode again
        e.Cancel = true;
        MessageBox.Show("Invalid name");
        // To continue editing mode
        e.ContinueEditing = true;
    }
}

Private Sub treeViewAdv1_NodeEditorValidating_1(ByVal sender As Object, ByVal e As TreeNodeAdvCancelableEditEventArgs)
    If e.Label = "Syncfusion" Then
        e.Cancel = False
        MessageBox.Show("Valid")
        e.ContinueEditing = False
    Else
        ' Cancel the label edit action, inform the user, and place the node in edit mode again.
        e.Cancel = True
        MessageBox.Show("Invalid name")
        ' To continue editing mode
        e.ContinueEditing = True
    End If
End Sub