gistfile1.cs

public enum Command
{
    Next,
    Reset
}

public enum State
{
    State1,
    State2,
    State3
}

void Main()
{
    var stateMachine = new StateMachine<State, Command>(State.State1)
    .AddTranslation(State.State1, Command.Reset, State.State1)
    .AddTranslation(State.State2, Command.Reset, State.State1)
    .AddTranslation(State.State3, Command.Reset, State.State1)
    .AddTranslation(State.State1, Command.Next, State.State2)
    .AddTranslation(State.State2, Command.Next, State.State3);

    Console.WriteLine(stateMachine.CurrentState);

    stateMachine.Trigger(Command.Next);
    Console.WriteLine(stateMachine.CurrentState);

    stateMachine.Trigger(Command.Reset);
    Console.WriteLine(stateMachine.CurrentState);
}