private void button4_Click(object sender, EventArgs e)
{ 
HttpWebRequest myHttpWebRequest = (HttpWebRequest)HttpWebRequest.Create("http://www.odnoklassniki.ru");
myHttpWebRequest.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/530.5 (KHTML, like Gecko) Chrome/2.0.172.37 Safari/530.5"; 
myHttpWebRequest.Accept = "application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5"; 
myHttpWebRequest.Headers.Add("Accept-Language", "ru-RU,ru;q=0.8,en-US;q=0.6,en;q=0.4"); 
HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
StreamReader myStreamReader = new StreamReader(myHttpWebResponse.GetResponseStream()); 
MessageBox.Show(myStreamReader.ReadToEnd()); 
string sCookies = ""; 
if (!String.IsNullOrEmpty(myHttpWebResponse.Headers["Set-Cookie"])) 
{ 
sCookies = myHttpWebResponse.Headers["Set-Cookie"]; 
}
}