public string GetShift(DayOfWeek day, int id)
{
Shift shift;
string value;
try
{
shift = Shifts.Single(x => x.Day == day && x.ScheduleID == id);
value = $"<a href='/admin/editshift/{shift.ID}'>{shift.ToString()}</a>";
} catch (Exception ex) when(ex is ArgumentNullException || ex is InvalidOperationException)
{
value = null;
}
return(value);
}