string loginvk = Convert.ToString(TextBoxLogin.Text);
                string passvk = Convert.ToString(TextBoxPassword.Text);
                String strURL = "https://oauth.vk.com/token?grant_type=password&client_id=3697615&client_secret=AlVXZFMUqyrnABp8ncuU&username="+loginvk+"&password="+passvk;
                HttpWebRequest objWebRequest;
                HttpWebResponse objWebResponse;
                StreamReader streamReader;
                String strHTML;
                objWebRequest = (HttpWebRequest)WebRequest.Create(strURL);
                objWebRequest.Method = "GET";
                objWebResponse = (HttpWebResponse)objWebRequest.GetResponse();
                streamReader = new StreamReader(objWebResponse.GetResponseStream(), System.Text.Encoding.GetEncoding("utf-8"));
                strHTML = streamReader.ReadToEnd();
                streamReader.Close();
                objWebResponse.Close();
                objWebRequest.Abort();
                string qwertyuiop = Convert.ToString(strHTML);
                MessageBox.Show(qwertyuiop, "1");