How do I pass HttpCookie authentication to HttpWebRequest

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C#3.5

cookie

When I try to download the page as html the pages does not hold the session and takes you back to the login page. How do I pass the HttpCookie to the HttpWebRequest for validation?
Or can it work with a session? The code works on a page that does not have a login session.

I already created the the encrypted cookie on login.
I just need to know how to read the cookie so HttpWebRequest knows the user is validated.

HttpWebRequest myWebRequest = (HttpWebRequest)HttpWebRequest.Create(this.Page.Request.Url.ToString());
  myWebRequest.Method = "GET";
  myWebRequest.AllowAutoRedirect = false;

  // make request for web page
  HttpWebResponse myWebResponse = (HttpWebResponse)myWebRequest.GetResponse();
                    
  StreamReader myWebSource = new StreamReader(myWebResponse.GetResponseStream());

  string myPageSource = string.Empty;
  myPageSource = myWebSource.ReadToEnd();

  myWebResponse.Close();