Best way to create a “run-once” time delayed function in C#

Question

I am trying to create a function that takes in an Action and a Timeout, and executes the Action after the Timeout. The function is to be non-blocking. The function must be

Answer 1

Use Microsoft's Reactive Framework (NuGet "System.Reactive") and then you can do this:

protected void Execute(Action action, int timeout_ms)
{
    Scheduler.Default.Schedule(TimeSpan.FromMilliseconds(timeout_ms), action);
}