You need to enable and disable the LabelEdit property if necessary:
private void startLabelEdit() {
treeView1.LabelEdit = true;
treeView1.SelectedNode.BeginEdit();
}
private void treeView1_AfterLabelEdit(object sender, NodeLabelEditEventArgs e) {
treeView1.LabelEdit = false;
}
, , LabelEdit Windows. . , . , .