C# struct sample

Program.cs

using System;

namespace ConsoleApp1
{
    public interface IEmployee
    {
        void DefaultRecords();
    }

    public enum Benefit
    {
        FullBenefit = 0,
        HalfBenefit = 1,
        None = 2
    }

    public struct Employee : IEmployee
    {
        #region fields

        private int _employeeId;
        private string _mobileNumber;
        private string _firstName;
        private string _lastName;

        #endregion

        #region constructor

        public Employee(string firstName, string lastName, string mobileNumber)
        {
            this._employeeId = 0;
            this._firstName = firstName;
            this._lastName = lastName;
            this._mobileNumber = mobileNumber;
            this.EmployeeBenefit = Benefit.FullBenefit;

        }

        #endregion

        #region properties

        public int EmployeeId { get { return _employeeId; } set { this._employeeId = value; } }

        public Benefit EmployeeBenefit { get; set; }

        public string MobileNumber { get { return this._mobileNumber; } }

        #endregion

        #region methods

        public bool HasMobileNumber()
        {
            return !string.IsNullOrEmpty(this._mobileNumber);
        }

        //Having a static method
        public static void IsEmployeeHappy()
        {
            Console.WriteLine("I'm only happy when you are happy");
        }

        //Implemented from an Interface
        public void DefaultRecords()
        {
            Console.WriteLine("No records found");
        }

        #endregion

    }

    class Program
    {
        static void Main(string[] args)
        {
            var emp = new Employee("Jin Vincent", "Necesario", "");

            Console.WriteLine($"Has Mobile Number: {emp.HasMobileNumber()}");

            Employee.IsEmployeeHappy();
        }
    }
}