using System;

using System.Threading;

using System.Threading.Tasks;

​

public class Program

{

    public static void Main()

    {

        DoIt().GetAwaiter().GetResult();

    }

    public async static Task DoIt() 

    {

        var results = await Task.WhenAll(

            RunTimeLimitedTask(10),

            RunTimeLimitedTask(1000));

        foreach(var result in results) Console.WriteLine(result);

    }

​

    public async static Task<string> RunTimeLimitedTask(int timeLimit)

    {

        var source = new CancellationTokenSource();

        source.CancelAfter(timeLimit);

​

        try {

            // mimic a web request that will take 500ms

            await Task.Run(async () => await Task.Delay(500, source.Token));

            return "Complete";

        }

        catch (TaskCanceledException) {

            return "Cancelled";

        }

    }

}