OpenTween.TweenMain.RefreshFollowerIdsAsync C# (CSharp) Method

        private async Task RefreshFollowerIdsAsync()
        {
            await this.workerSemaphore.WaitAsync();
            try
            {
                this.StatusLabel.Text = Properties.Resources.UpdateFollowersMenuItem1_ClickText1;

                await this.tw.RefreshFollowerIds();

                this.StatusLabel.Text = Properties.Resources.UpdateFollowersMenuItem1_ClickText3;

                this.RefreshTimeline();
                this.PurgeListViewItemCache();
                this._curList?.Refresh();
            }
            catch (WebApiException ex)
            {
                this.StatusLabel.Text = $"Err:{ex.Message}(RefreshFollowersIds)";
            }
            finally
            {
                this.workerSemaphore.Release();
            }
        }