C# POSTING TO URL

Hello guys, I'm looking for someone who has a really big experience in posting to a url. Job is simple and will not take long probably a few seconds for someone who knows what they are doing. I'm currently posting like this var tasks = new List<Task<string>>(); for (int i = 0; i <[login to view URL](); i++) { int g = i; var postParameters = new NameValueCollection(); try { Accounts ac = accoutList[i]; [login to view URL]([login to view URL](() => { return GetWebResponse("https://test-to-show-you/authenticate", g); })); } catch { } } But need to help on posting data to the url.