Question

The title pretty much stands for itself. But I am using an HTTPWebRequest to download pages from the internet, but these pages require a login, so you log in with the WebBrowser and it uses the resulting cookies to be able to download the actual page.

Answer 1

HttpWebRequest request = (HttpWebRequest) WebRequest.Create (myUri);
request.CookieContainer = new CookieContainer ();
request.CookieContainer.SetCookies (myUri, webBrowser1.Document.Cookie);

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Edit: For your case, you may consider a NetworkCredential Object. It will work perfectly without any need for a WebBrowser or Cookies.

 WebRequest myWebRequest = WebRequest.Create(url);
    NetworkCredential networkCredential = new NetworkCredential(username, password);
    myWebRequest.Credentials = networkCredential;