C# 读取网络txt文件 并写在本地txt文件中

public void WriteStream()
        {
            try
            {
               stirng ImagesPath = ImagesPath + "\\2013-09-27.txt";
                HttpWebRequest oHttp_Web_Req = (HttpWebRequest)WebRequest.Create("http://tuitui.uzai.com/baiduBosom/index.20130927.txt");
                Stream oStream = oHttp_Web_Req.GetResponse().GetResponseStream();
                using (StreamReader respStreamReader = new StreamReader(oStream, Encoding.UTF8))
                {
                    string line = string.Empty;
                    while ((line = respStreamReader.ReadLine()) != null)
                    {
                        
                                UTF8Encoding utf8 = new UTF8Encoding(false);
                                //写txt文件
                                using (StreamWriter sw = new StreamWriter(ImagesPath, true, utf8))
                                {
                                  
                                    sw.WriteLine(line);
                                }

                    }
                }
            }
            catch (Exception ex)
            {

            }
        }