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

        public System.IO.Stream OpenWrite(System.Uri address) { throw null; }
        public System.IO.Stream OpenWrite(string address, string method) { throw null; }

        public Form1()
        {
            InitializeComponent();

            WebClient client = new WebClient();
            Stream stream1 = client.OpenRead("http://www.baidu.cn");
            StreamReader sr = new StreamReader(stream1);
            string line;
            while ((line = sr.ReadLine()) != null)
            {
                listBox1.Items.Add(line);
            }

            stream1.Close();

            try
            {
                Stream stream2 = client.OpenWrite("http://localhost/accept/newfile.txt", "PUT");
                StreamWriter sw = new StreamWriter(stream2);
                sw.WriteLine("Hello Web");
                stream2.Close();
            }
            catch (System.Exception)
            {

            }

            //异步加载WebRequest
            WebRequest wr = WebRequest.Create("http://www.reuters.com");
            wr.BeginGetResponse(new AsyncCallback(OnResponse), wr);
        }