reuse of variables

Question

I'm working on project that need do call the same method several times, but with different arguments.

Can I use the same variable or do I have to declare another variable?

For example:

HttpWebRequest req = (HttpWebRequest)WebRequest.Create(domains["ServiceLogin"]);
            req.Method = "GET";
            req.Referer = "Mozilla/5.0 (X11; Linux i686; rv:6.0) Gecko/20100101 Firefox/6.0";
            req.CookieContainer = new CookieContainer();
            HttpWebResponse response = (HttpWebResponse)req.GetResponse();
            CookieCollection cookies = response.Cookies;
            response.Close();

etc..

Do I use the req variable or declare req2 for example

  req = (HttpWebRequest)WebRequest.Create(domains["ServiceLogin"]);
  req.Method = "POST";
  req.CookieContainer = myCookieContainer;

What's the best way/practice to do this?

Answer 1

Local variables are cheap; there's no compelling benefit to re-using them unnecessarily. Therefore: write your code so that each variable has a clear purpose and that purpose is described by its name. Once each variable's name describes its purpose, it will become more clear whether you need one variable or multiple variables.