C# proprities Shorthand does not work perfictly

Question

I have class Employees and it has some fields. I use shorthand proprities but it does not work in some time. If I use regular way it works

using System;

 namespace ConsoleApp13
 {
  class Employees
   {
    string firstName;
    string lastName;
    int age;
    string department;
    double salary;

    public string FirstName { set; get; }
    public string LastName { set; get; }
    public int Age { set; get; }
    public string Department { set; get; }
    public double Salary { set { salary = value; } }

    public void EntringData()
    {
        Console.Write("Enter First Name: ");
        firstName = Console.ReadLine();

        Console.Write("Enter last Name: ");
        lastName = Console.ReadLine();

        Console.Write("Enter Your Age: ");
        age = Convert.ToInt32(Console.ReadLine());

        Console.Write("Enter Your Department: ");
        department = Console.ReadLine();

        Console.Write("Enter Your Salary: ");
        salary = Convert.ToDouble(Console.ReadLine());

    }

    public void Printing()
    {
        Console.WriteLine("{0,-15} {1,-10} {2,-10} {3,-10} {4,10}", firstName , lastName , age , department , salary);
    }


}}

Program.cs

using System;

namespace ConsoleApp13
{
 class Program
 {
    static void Main(string[] args)
    {
        Employees e1 = new Employees();
        e1.EntringData();
        Console.WriteLine();
        e1.Printing();

        e1.Salary = 15000;

        e1.Printing();

       

    }
}}

As you can seen in above code, salary proprity has regular way and it is work fine in Program.cs. If I change it to shorthand it does not changed

I changed salary proprity to be as shorthand and the result is

Answer 1

等待大神解答