C#中簡單的this與get的用法(string,decimal)

namespace First
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Employee E1 = new Employee("xiaohong","you");
           E1.Salary =4.2m;
            E1.printEmployee();
            this.Close();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            MessageBox.Show("Hi");
            this.Close();
        }
    }
    class Employee
    {
        private string name;
        private string alias;
        private decimal salary;
        public Employee(string name, string alias)
        {
            this.name = name;
            this.alias = alias;
        }
        public decimal Salary
        {
            get
            {
                return salary;
            }
            set
            {
                salary = value;
            }
        }
        
        public void printEmployee()
        {
            MessageBox.Show("Name:" + name +"
"+ "Alias:" + alias +"
"+ "num:" + salary);
           // MessageBox.Show( Employee.SalcTax(this));

        }
    }
}

namespace First
{
    public partial class