Retry Pattern in C#

I'm not sure I want to share this, or encourage this... but it's a piece of code I wrote for doing a "retry" of an unreliable action.

public bool Retry(Action a, int maxRetries = 10)
{
	int retries = 0;
	int sleepDelay = 500;
	bool succeeded = false;
	while (!succeeded && retries < maxRetries)
	{
		try
		{
			a();
			succeeded = true;
		}
		catch (Exception ex)
		{
			retries++;
			System.Threading.Thread.Sleep(sleepDelay);

			if (retries == maxRetries)
			{
				throw new Exception("Ran out of retries", ex);
			}

			sleepDelay = sleepDelay * 2; // exponential back-off.
		}
	}

	return succeeded;
}