GreetingsOrchestration2.cs

public class GreetingsOrchestration2 : TaskOrchestration<string,int>
{
    public override async Task<string> RunTask(OrchestrationContext context, int secondsToWait)
    {
        var user = context.ScheduleTask<string>("DurableTaskSamples.Greetings.GetUserTask", string.Empty);
        var timer = context.CreateTimer<string>(context.CurrentUtcDateTime.AddSeconds(secondsToWait), "TimedOut");

        var u = await Task.WhenAny(user, timer);
        string greeting = await context.ScheduleTask<string>("DurableTaskSamples.Greetings.SendGreetingTask", string.Empty, u.Result);

        return greeting;
    }
}