public static int GetSpecialtyId(int staffId)
{
Staff staff = Staffs.Find(s => s.Id == staffId);
return(staff.SpecialtyId);
}
private static string GetStaffName(int staffId)
{
Staff staff = Staffs.Find(s => s.Id == staffId);
return(string.Format("{0}, {1}", staff.FirstName, staff.LastName));
}