OpenTween.ListAvailable.ListAvailable_Shown C# (CSharp) Method

        private async void ListAvailable_Shown(object sender, EventArgs e)
        {
            using (ControlTransaction.Disabled(this))
            {
                try
                {
                    var lists = (IReadOnlyList<ListElement>)TabInformations.GetInstance().SubscribableLists;
                    if (lists.Count == 0)
                        lists = await this.FetchListsAsync();

                    this.UpdateListsListBox(lists);
                }
                catch (OperationCanceledException)
                {
                    this.DialogResult = DialogResult.Cancel;
                    return;
                }
                catch (WebApiException)
                {
                    this.DialogResult = DialogResult.Abort;
                    return;
                }
            }
        }