string URLAddress = @"http://xiazai.vevb.com";string receivePath=@"C:/";client.DownloadFile(URLAddress, receivePath + System.IO.Path.GetFileName(URLAddress));

　Stream str = client.OpenRead(URLAddress); StreamReader reader = new StreamReader(str); byte[] mbyte = new byte[1000000]; int allmybyte = (int)mbyte.Length; int startmbyte = 0; while (allmybyte > 0) { int m = str.Read(mbyte, startmbyte, allmybyte); if (m == 0)  break; startmbyte += m; allmybyte -= m; } reader.Dispose(); str.Dispose(); string path = receivePath + System.IO.Path.GetFileName(URLAddress); FileStream fstr = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write); fstr.Write(mbyte, 0, startmbyte); fstr.Flush(); fstr.Close();