C#This关键字

using System;
   public class Employee
    {
        public int id; 
        public String name;
        public float salary;
        public Employee(int id, String name,float salary)
        {
            this.id = id;
            this.name = name;
            this.salary = salary;
        }
        public void display()
        {
            Console.WriteLine(id + " " + name+" "+salary);
        }
   }
   class TestEmployee{
       public static void Main(string[] args)
        {
            Employee e1 = new Employee(101, "Sonoo", 890000f);
            Employee e2 = new Employee(102, "Mahesh", 490000f);
            e1.display();
            e2.display();

        }
    }