static void Main(string[] args) { List <Person> persons = new List <Person>() { new Person { FirstName = "Georgeta-Maria", LastName = "Blagoci", Id = "024", HasPaid = true }, new Person { FirstName = "Maria-Ana", LastName = "Blagoci", Id = "025", HasPaid = false }, new Person { FirstName = "Ion", LastName = "Gheorghe", Id = "026", HasPaid = true }, new Person { FirstName = "Vasile", LastName = "Blaj", Id = "027", HasPaid = true } }; List <Talks> talks1 = new List <Talks>() { new Talks { Subjects = "All about C#", SeatsAvaillable = 2, Datetimes = "3/10/2020 11:10" }, new Talks { Subjects = "All about python", SeatsAvaillable = 10, Datetimes = "7/10/2020 4:10" }, new Talks { Subjects = "All about ciste", SeatsAvaillable = 30, Datetimes = "7/10/2020 4:10" } }; var speakers = new Speakers(); var attendees = new Attendees(); var talks = new Talks(); speakers.ReadFromFile("Data\\Speakers.csv"); speakers.DisplayAllMembers(); speakers.WriteToFile("Data\\DataSpeakers.csv"); attendees.ReadFromFile("Data\\DataAttendees.csv"); attendees.AddPeople(persons); attendees.DisplayAllMembers(); attendees.WriteToFile("Data\\Attendees.csv"); talks.AddTalkMeeting(talks1); talks.AddPeopleToTalk(persons, "python", speakers.SpeakersList, "603"); talks.AddPeopleToTalk(attendees.People, "C#", speakers.SpeakersList, "546"); talks.AddPeopleToTalk(attendees.People, "ciste", speakers.SpeakersList, "622"); talks.AddPeopleToTalk(attendees.People, "ciste", speakers.SpeakersList, "660"); talks.AddPeopleToTalk(attendees.People, "ciste", speakers.SpeakersList, "641"); talks.ReadFromFile("Data\\DataTalks.csv"); talks.DisplayAllMembers(); talks.DisplayOneTalk(1); talks.WriteToFile("Data\\Talks.csv"); }