IfcDoc.FormEdit.treeView_BeforeLabelEdit C# (CSharp) Method

        private void treeView_BeforeLabelEdit(object sender, NodeLabelEditEventArgs e)
        {
            object target = e.Node.Tag;
            if (target is DocSection)
            {
                int iSection = this.m_project.Sections.IndexOf((DocSection)target);
                e.CancelEdit = (iSection < 4 || iSection > 7);
            }
            else if (target is DocObject)
            {
                e.CancelEdit = false;
            }
            else
            {
                e.CancelEdit = true;
            }
        }