HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create("https://iss.moex.com/iss/apps/rms3/rates.csv");
HttpWebResponse response2 = (HttpWebResponse)myReq.GetResponse();
StreamReader stream2 = new StreamReader(response2.GetResponseStream());
string s2 = stream2.ReadToEnd();
MessageBox.Show(s2);