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url=http://192.168.1.105/SharpZipLib/1.rar //Õâ¸öÊÇ·þÎñÆ÷×ÊÔ´
filename=E:\ÏÂÔصØÖ·±£´æ\1.rar    //Õâ¸öÏÂÔص½±¾µØ±£´æ·¾¶
            System.Net.HttpWebRequest Myrq = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(URL);
            System.Net.HttpWebResponse myrp = (System.Net.HttpWebResponse)Myrq.GetResponse();
            long totalBytes = myrp.ContentLength;
            System.IO.Stream st = myrp.GetResponseStream();
            System.IO.Stream so = new System.IO.FileStream(filename, System.IO.FileMode.Create);
            long totalDownloadedByte = 0;
            byte[] by = new byte[1024];
            int osize = st.Read(by, 0, (int)by.Length);
            while (osize > 0)
            {
                totalDownloadedByte = osize + totalDownloadedByte;
                so.Write(by, 0, osize);
                osize = st.Read(by, 0, (int)by.Length);
            }