System.Net.WebClient.DownloadDataAsync C# (CSharp) Method

        public void DownloadDataAsync(System.Uri address) { }
        public void DownloadDataAsync(System.Uri address, object userToken) { }

        public void DownloadDataCompletedExample()
        {
            var waitForAsync = new ManualResetEvent(false);
            var webClient    = new WebClient();
            byte[] result    = null;

            webClient.DownloadDataCompleted += (sender, args) =>
            {
                if (args.Error != null)
                {
                    throw args.Error;
                }
                else
                {
                    result = args.Result;
                }
                
                waitForAsync.Set();
            };

            webClient.DownloadDataAsync(new Uri("http://www.google.com/"));

            waitForAsync.WaitOne();

            Assert.IsNotNull(result);
        }