Solution Review: Implement the Rectangle Class

// Class Rectangle
class Rectangle {
  // Private Fields
  private int _length;
  private int _width;
  // Parameterized Constructor
  public Rectangle(int length, int width) {
    this._length = length;
    this._width = width;
  }
  // Method to calculate Area of a rectangle
  public int GetArea() {
    return this._length * this._width; 
  }
  
}
class Program {
  public static void Main(){
    Rectangle obj = new Rectangle(2,2);
    System.Console.WriteLine(obj.GetArea());
  }
}