public class AsyncWebClient
    {
        public string GetContent(string url)
        {
            return GetWebContent(url).Result.ToString();
        }
        private Task<string> GetWebContent(string url)
        {
            var wc = new WebClient();
            TaskCompletionSource<string> tcs = new TaskCompletionSource<string>();

            wc.DownloadStringCompleted += (obj,args) =>
            {
                if (args.Cancelled == true)
                {
                    tcs.TrySetCanceled();
                    return;
                }

                if (!String.IsNullOrEmpty(args.Result))
                    tcs.TrySetResult(args.Result);
            };

            wc.DownloadStringAsync(new Uri(url));
            return tcs.Task;
        }
    }

并致电：

var wc =new AsyncWebClient();
var html = wc.GetContent("http://truyen.vnsharing.net/");    >> always get the above error

如果我使用其他网站,那么它的工作正常.不知道这个网站有什么特别之处.

请帮忙 ！！