How to make a Unique folder name?

Question

how it possible?

 HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://www.google.co.in/");

        HttpWebResponse response = (HttpWebResponse)request.GetResponse();

        Stream receiveStream = response.GetResponseStream();

        StreamReader readStream = new StreamReader(receiveStream, Encoding.UTF8);

        StreamWriter sw = new StreamWriter("E:/Content/{0:ddMMyyhhmmss}{1},DateTime.Now/.text");

        String line;

        while ((line = readStream.ReadLine()) != null)

        {

            sw.WriteLine(line);

        }

        sw.Close();