Migrating to Version 5

var machine = new PassiveStateMachine<States, Events>("my state machine");

machine
    .In(States.Off)
    .On(Events.TurnOn)
        .Goto(States.On)
        .Execute(SayHello);

machine
    .In(States.On)
    .On(Events.TurnOff)
        .Goto(States.Off)
        .Execute(SayBye);

machine
    .Initialize(States.Off);

machine
    .Start();

// create a definition builder
var builder = new StateMachineDefinitionBuilder<States, Events>();

builder
    .In(States.Off)
    .On(Events.TurnOn)
        .Goto(States.On)
        .Execute(SayHello);

builder
    .In(States.On)
    .On(Events.TurnOff)
        .Goto(States.Off)
        .Execute(SayBye);

builder
    .WithInitialState(States.Off); // the initial state is now set during definition time

// create the definition to later spawn state machines from it
var definition = builder
    .Build();

// create as many state machines as you need from the same definition
var machine =    
    .CreatePassiveStateMachine("my state machine"); // you can also create an active state machine

machine
    .Start();