Classes for my blog post on Object Creation.

BadDojo.cs

	sealed class BadDojo
	{
		public IList<Student> Students { get; set; }
		public Sensei Sensei { get; set; }

		public string Summary => $"this dojo is run by {Sensei.Name} and has {Students.Count} students";
	}

DojoLand.cs

	abstract class Person
	{
		public string Name { get; set; }

		protected Person(string name)
		{
			Name = name;
		}
	}

	sealed class Sensei : Person
	{
		public Sensei(string name) : base(name)
		{
		}
	}

	sealed class Student : Person
	{
		public Student(string name) : base(name)
		{
		}
	}

GoodDojo.cs

	sealed class GoodDojo
	{

		private readonly IList<Student> students;
		public Sensei Sensei { get; }

		public IEnumerable<Student> Students => this.students;

		public GoodDojo(Sensei sensei)
		{
			Sensei = sensei;
			this.students = new List<Student>();
		}

		public GoodDojo(Sensei sensei, IEnumerable<Student> students)
		{
			Sensei = sensei;
			this.students = students.ToList();
		}

		public string Summary => $"this dojo is run by {Sensei.Name} and has {Students.Count()} students";
	}

UsingBadDojo.cs

	class Program
	{
		static void Main(string[] args)
		{
			var badDojo = new BadDojo()
			{
				Sensei = new Sensei("Barney")
			};

			Console.WriteLine(badDojo.Summary);
		}
	}

UsingGoodDojo.cs

	class Program
	{
		static void Main(string[] args)
		{
			var goodDojo = new GoodDojo(new Sensei("Dom"));

			Console.WriteLine(goodDojo.Summary);

			Console.ReadKey();
		}
	}