using System;

using System.Collections.Generic;

​

namespace ConsoleApp7

{

    /*Write a program for Online Attendance.  The conditions are as follows:

​

    User provides their name as Input and then application show message to "Welcome to their Name".

    Jack, Steven and Mathew are banned for the organization. So, when any user enters Jack, Steven 

    and Mathew as user name, the application raised an event and fire alarm as well as sends email

    to administration.

    */

    class Program

    {

        static void Main(string[] args)

        {

            Console.WriteLine("Enter name:");

            string Name = Console.ReadLine();

            HashSet<string> bannedUsers = new HashSet<string>() { "Jack", "Steven", "Mathew" };

            if (!bannedUsers.Contains(Name))

            {

                Console.WriteLine("Welcome "+ Name);

            }

            else {

                //fire event

                Console.WriteLine("User banned");

                var userBanned = new UserBanned();

                Person person = new Person();

                userBanned.UserBannedEvent += person.UserBanned;

​

                userBanned.Alert(Name);

            }

        }

​

        public class Person

        {

            public string name { get; set; }

​

            public void UserBanned(object sender, UserBannedEventArgs e)

            {

                Console.WriteLine("Get out of bed it's {0}", e.Name);

            }

​

        }

​

        public class UserBanned

        {

            public event UserBannedEventHandeler UserBannedEvent;

​

            public void Alert(string name)

            {

                Console.WriteLine("User banned");

                if (UserBannedEvent != null)

                {

                    new UserBannedEventHandeler(this, new UserBannedEventArgs(name));

                }

​

            }

        }

​

        public delegate void UserBannedEventHandeler(object source, UserBannedEventArgs e);

        public class UserBannedEventArgs : EventArgs

        {

            public string Name { get; set; }

            public UserBannedEventArgs(string name)

            {

                this.Name = name;

​

            }

        }

​

    }

​

​

}

​