public async Task AddCalendar(long userId, CalendarViewModel calendarViewModel)
{
using (var tran = new TransactionScope(TransactionScopeAsyncFlowOption.Enabled))
{
var calendar = await calendarRepository.CreateAsync(new Calendar
{
Group = calendarViewModel.Group,
Title = calendarViewModel.Title
});
await userRepository.AddCalendar(userId, calendar);
tran.Complete();
}
}