static class Test_Switch
	{
		internal static void Go()
		{
			GroupMember groupMember = new GroupMember(1, "Gregory", "Adam", 234, "none");
			MKVP mkvp = new MKVP("LAST", "Alan");

			new Switch()
			.Case(() => mkvp.Key == "FIRST", delegate { groupMember.FirstName = mkvp.Value; } )
			.Case(() => mkvp.Key == "LAST",	delegate { groupMember.LastName = mkvp.Value; })
			.Default(delegate { throw new Exception("No otherwise/default"); })
			.Execute();

			Console.WriteLine("{0} {1} ", groupMember.FirstName, groupMember.LastName);
		}
	}
	class MKVP
	{
		public string Key;
		public string Value;
		public MKVP(string key, string value)
		{
			Key = key;
			Value = value;
		}
	}
	class GroupMember
	{
		public int PrimaryKey;
		public string FirstName;
		public string LastName;
		public long GuestNo;
		public string Notes;
		public GroupMember(int primaryKey, string firstName, string lastName, long guestNo, string notes)
		{
			PrimaryKey = primaryKey;
			FirstName = firstName;
			LastName = lastName;
			GuestNo = guestNo;
			Notes = notes;
		}
	}

	class Switch
	{
		bool HadDefault = false;
		List<Tuple<Func<bool>, Action>> Cases = new List<Tuple<Func<bool>,Action>>();

		internal Switch Case(Func<bool> predicate, Action action)
		{
			CheckDefault();
			if (predicate == null)
				throw new ArgumentNullException("predicate");

			CheckAction(action);
			Cases.Add(new Tuple<Func<bool>, Action>(predicate, action));

			return this;
		}
		internal Switch Default(Action action)
		{
			CheckDefault();
			CheckAction(action);

			Cases.Add(new Tuple<Func<bool>,Action>(() => true, action));
			HadDefault = true;

			return this;
		}

		internal void Execute()
		{
			foreach( var item in Cases )
				if( item.Item1() )
				{
					item.Item2();
					break;
				}
		}
		void CheckDefault()
		{
			if( HadDefault )
				throw new Exception("Sorry, already a Default");
		}
		void CheckAction(Action action)
		{
			if( action == null )
				throw new ArgumentNullException("action");
		}
	}