private async Task LoadSelectedRangeReleaseNotesAsync()
{
IWorkItemRepository workItemRepository = _provider.GetRequiredService <IWorkItemRepository>();
ReleaseTag @base = lstStartRelease.SelectedItem as ReleaseTag;
ReleaseTag head = lstEndRelease.SelectedItem as ReleaseTag;
IList <WorkItem> workItems = await workItemRepository.GetReleaseWorkItemsInRangeAsync(@base, head);
DisplayWorkItems(workItems);
}