FluentScheduler

using FluentScheduler;

public class MyRegistry : Registry
{
    public MyRegistry()
    {
        // Schedule an IJob to run at an interval
        Schedule<MyJob>().ToRunNow().AndEvery(2).Seconds();

        // Schedule an IJob to run once, delayed by a specific time interval
        Schedule<MyJob>().ToRunOnceIn(5).Seconds();

        // Schedule a simple job to run at a specific time
        Schedule(() => Console.WriteLine("It's 9:15 PM now.")).ToRunEvery(1).Days().At(21, 15);

        // Schedule a more complex action to run immediately and on an monthly interval
        Schedule<MyComplexJob>().ToRunNow().AndEvery(1).Months().OnTheFirst(DayOfWeek.Monday).At(3, 0);

        // Schedule a job using a factory method and pass parameters to the constructor.
        Schedule(() => new MyComplexJob("Foo", DateTime.Now)).ToRunNow().AndEvery(2).Seconds();

        // Schedule multiple jobs to be run in a single schedule
        Schedule<MyJob>().AndThen<MyOtherJob>().ToRunNow().AndEvery(5).Minutes();
    }
}

var registry = new Registry();
registry.Schedule<MyJob>().ToRunNow().AndEvery(2).Seconds();
registry.Schedule<MyJob>().ToRunOnceIn(5).Seconds();
registry.Schedule(() => Console.WriteLine("It's 9:15 PM now.")).ToRunEvery(1).Days().At(21, 15);
registry.Schedule<MyComplexJob>().ToRunNow().AndEvery(1).Months().OnTheFirst(DayOfWeek.Monday).At(3, 0);
registry.Schedule<MyJob>().AndThen<MyOtherJob>().ToRunNow().AndEvery(5).Minutes();

protected void Application_Start()
{
    JobManager.Initialize(new MyRegistry());
} 

JobManager.AddJob(() => Console.WriteLine("Late job!"), (s) => s.ToRunEvery(5).Seconds());

public class SampleJob : IJob, IRegisteredObject
{
    private readonly object _lock = new object();

    private bool _shuttingDown;

    public SampleJob()
    {
        // Register this job with the hosting environment.
        // Allows for a more graceful stop of the job, in the case of IIS shutting down.
        HostingEnvironment.RegisterObject(this);
    }

    public void Execute()
    {
        try
        {
            lock (_lock)
            {
                if (_shuttingDown)
                    return;

                // Do work, son!
            }
        }
        finally
        {
            // Always unregister the job when done.
            HostingEnvironment.UnregisterObject(this);
        }
    }

    public void Stop(bool immediate)
    {
        // Locking here will wait for the lock in Execute to be released until this code can continue.
        lock (_lock)
        {
            _shuttingDown = true;
        }

        HostingEnvironment.UnregisterObject(this);
    }
}

JobManager.Stop();

JobManager.StopAndBlock();

JobManager.JobException += info => Log.Fatal("An error just happened with a scheduled job: " + info.Exception);

public class MyRegistry : Registry
{
    Schedule<MyJob>().NonReentrant().ToRunEvery(2).Seconds();
}

public class MyRegistry : Registry
{
    NonReentrantAsDefault();
    Schedule<MyJob>().ToRunEvery(2).Seconds();
}

JobManager.UseUtcTime();

// Every "zero" weeks
Schedule<MyJob>().ToRunEvery(0).Weeks().On(DayOfWeek.Monday).At(14, 0);

// Every "one" weeks
Schedule<MyJob>().ToRunEvery(1).Weeks().On(DayOfWeek.Monday).At(14, 0);