Constructor

//In Forest.cs

using System;

namespace BasicClasses
{
  class Forest
  {
    //Fields
    public int age;
    private string biome;

    //Constructor
    public Forest(string name, string biome){
      Name = name;  //set the Name property
      Biome = biome;    //set the Biome property
      Age = 0;
    }

    //Properties
    public string Name
    { get; set; }

    public int Trees
    { get; set; }

    public string Biome
    {
      get { return biome; }
      set
      {
        if (value == "Tropical" || value == "Temperate" || value == "Boreal")
        {
          biome = value;
        }
        else
        {
          biome = "Unknown";
        }
      }
    }

    public int Age
    {
      get { return age; }
      private set { age = value; }
    }

    //Methods
    public int Grow()
    {
      Trees += 30;
      Age += 1;
      return Trees;
    }

    public int Burn()
    {
      Trees -= 20;
      Age += 1;
      return Trees;
    }

  }
}
============================================================================================================================
//In Program.cs file
using System;

namespace BasicClasses
{
  class Program
  {
    static void Main(string[] args)
    {

      Forest f = new Forest("Congo", "Desert" ); //call the constructor by writing variable values as the arguments

      f.Trees = 0;
      /* Hence we can delete
        f.Name = "Congo";
        f.Biome = "Desert";
      as the lines are not needed
      */

      Console.WriteLine(f.Name);
      Console.WriteLine(f.Biome);

    }
  }
}