How i can read website, add values in two input (username and password) and submit form in code behind

Question

I use the WebRequest class to read the site, after this, I have a string variable que stores all site content. At this point, I add two values in two inputs. After adding These two values, how do I give to submit the form?

My code:

WebRequest request = WebRequest.Create(uri);
WebResponse response = request.GetResponse();
Stream dataStream = response.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);

string retorno = reader.ReadToEnd();

retorno = retorno.Replace("<input id=\"username\"", "<input id=\"username\" value=\"[email protected]\" ").Replace("<input id=\"password\"", "<input id=\"password\" value=\"xxxxx\" ");

Answer 1

Try this

• First make HTTP GET request to have Cookies/Session values from Response object which will be used in further request.

• Make HTTP POST (with attached cookie/session values if any from
  previous steps) request to website with input values as content.
  username='xxxx'&password='zzzzzzzzzz'

• Use Fiddler/DeveloperTools to see what's going
  on(Headers/Cookies/Session/Form data) when you browser and submit in browser and replicate samethings in C# using WebRequest/WebClient