Cleanest way to write a retry logic. Reference from: http://stackoverflow.com/questions/1563191/c-sharp-cleanest-way-to-write-retry-logic#answer-1563234

retry.cs

public static class Retry {
    public static void Do(
        Action action,
        TimeSpan retryInterval,
        int retryCount = 3) {

        Do<object>(() => {
            action();
            return null;
        }, retryInterval, retryCount);
    }

    public static T Do<T>(
        Func<T> action,
        TimeSpan retryInterval,
        int retryCount = 3) {
        var exceptions = new List<Exception>();

        for (int retry = 0; retry < retryCount; retry++) {
            try {
                if (retry > 0)
                    Thread.Sleep(retryInterval);
                return action();
            } catch (Exception ex) {
                exceptions.Add(ex);
            }
        }

        throw new AggregateException(exceptions);
    }
}