Awaitable async file download with HttpWebRequest

gistfile1.cs

public class ImageDownloader
{
	public async Task<byte[]> Download(string url)
	{
		var request = (HttpWebRequest) HttpWebRequest.Create(url);
		var response = await Task<WebResponse>.Factory.FromAsync(request.BeginGetResponse, request.EndGetResponse, null);
		using (var mStream = new MemoryStream())
		{
			response.GetResponseStream().CopyTo(mStream);
			return mStream.ToArray();
		}
	}
}