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)
{

}
}