using System;

using System.Threading.Tasks;

public class Program

{

    public static async void Main()

    {

        var res1 = await CallAsyncMethodWithRetries(() => TestMethod("false"), 1, 1);

        var res2 = await CallAsyncMethodWithRetries(() => TestMethod("true"), 1, 1);

​

        Console.WriteLine("Result 1 = " + res1);

        Console.WriteLine("Result 2 = " + res2);

    }

    private static async Task<bool> TestMethod(string arg) {

        return await Task.Run(() => arg == "true");

    }

    private static async Task<bool> CallAsyncMethodWithRetries(

        Func<Task<bool>> callback, int maxAttempts, int delay)

    {

        int numOfTries = 0;

​

        while (!await callback() && ++numOfTries < maxAttempts)

            await Task.Delay(delay);

​

        return numOfTries < maxAttempts;

    }

}

​