ExponentialBackoff Implemantation via C#.

_Usage.cs

async Task Main()
{
    // minimum implemetation
    try
    {
        var cts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
        var retries = 0;
        var maxRetry = 10;
        do
        {
            Console.WriteLine($"Simple. retries: {retries}");
            await Task.Delay((Math.Min((int)Math.Pow(2, retries), maxRetry) * 1000), cts.Token);
        } while (retries++ < 10);
    }
    catch (TaskCanceledException ex)
    {
        Console.WriteLine("timeout reached.");
    }

    // with ExponentialBackoff class
    try
    {
        var cts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
        var limit = 0;
        var exponentialBackoff = new ExponentialBackoff(100, 5000);
        while (limit++ < 10)
        {
            Console.WriteLine($"Class. retries: {exponentialBackoff.Retries}");
            await exponentialBackoff.DelayAsync(cts.Token);
        }
    }
    catch (TaskCanceledException ex)
    {
        Console.WriteLine("timeout reached.");
    }
}

ExponentialBackoff.cs

public class ExponentialBackoff
{
    private readonly int _delayMilliseconds;
    private readonly int _maxDelayMilliseconds;
    public int Retries => _retries;
    private int _retries;
    private int _pow;

    public ExponentialBackoff(int delayMilliseconds, int maxDelayMilliseconds)
    {
        _delayMilliseconds = delayMilliseconds;
        _maxDelayMilliseconds = maxDelayMilliseconds;
         _retries = 0;
         _pow = 0;
    }

    public async ValueTask DelayAsync(CancellationToken ct = default)
    {
        Interlocked.Increment(ref _retries);
        if (_retries < 31)
        {
            Interlocked.Increment(ref _pow);
        }
        var delay = (Math.Min(_delayMilliseconds * (int)Math.Pow(2, _pow - 1), _maxDelayMilliseconds));
        await Task.Delay(delay, ct).ConfigureAwait(false);
    }
}

Result.log

Simple. retries: 0
Simple. retries: 1
Simple. retries: 2
Simple. retries: 3
timeout reached.
Class. retries: 0
Class. retries: 1
Class. retries: 2
Class. retries: 3
Class. retries: 4
Class. retries: 5
Class. retries: 6
timeout reached.