using System;
using System.Collections;

namespace RickyTest
{
    public class starter
    {
        public static void Main()
        {
            Employee obj1 = new Employee(5678);
            Employee obj2 = new Employee(5678);
            if (obj1 == obj2)
            {
                Console.WriteLine("Equals");
            }
            else
            {
                Console.WriteLine("Not equals");
            }
        }
    }

    public class Employee
    {
        public Employee(int id)
        {
            if (id < 1000 || id > 9999)
            {
                throw new Exception("Invalid Employee");
            }
            propID = id;
        }

        public static bool operator ==(Employee obj1, Employee obj2)
        {
            return obj1.Equals(obj2);
        }

        public static bool operator !=(Employee obj1, Employee obj2)
        {
            return !obj1.Equals(obj2);
        }

        public override bool Equals(object obj)
        {
            Employee _obj = obj as Employee;

            if (obj == null)
            {
                return false;
            }
            return this.GetHashCode() == _obj.GetHashCode();
        }

        public override int GetHashCode()
        {
            return EmplID;
        }

        public string FullName
        {
            get
            {
                return propFirst + " " + propLast;
            }
        }

        private string propFirst;
        public string First
        {
            get
            {
                return propFirst;
            }
            set
            {
                propFirst = value;
            }
        }

        private string propLast;
        public string Last
        {
            get
            {
                return propLast;
            }
            set
            {
                propLast = value;
            }
        }

        private readonly int propID;
        public int EmplID
        {
            get
            {
                return propID;
            }
        }

        public override string ToString()
        {
            return FullName;
        }
    }
}