public string InviteSeat(int UserID, int ScreeningID, int SeatNumber)//checked { string dateNow = Invitation.DateToday(); string screeningDate = Screening.ScreeningDate(ScreeningID); DateTime dt1 = DateTime.Today; DateTime dt2 = DateTime.Parse(screeningDate); TimeSpan dateDiff = dt2 - dt1; string msg; //Console.WriteLine(dateDiff); if (dateDiff.Days > 1) { string time = Invitation.DateToday(); Invitation.OrderTicket(UserID, time, SeatNumber, ScreeningID); msg = "Buying Success"; } else { msg = "Screening is unavilable"; } return(msg); }