this() and constructor

using System;

class Rectangle {
   public int Width;
   public int Height;
   
   public Rectangle():this(0,0){
     

   }
   public Rectangle(int w, int h){
      Width = w;
      Height = h;
   }
}
class Program
{
    static void Main(string[] args)
    {
        Rectangle r = new Rectangle();
        Console.WriteLine(r.Width);

        Rectangle r2 = new Rectangle(2, 3);
        Console.WriteLine(r.Width);
    }
}