mvaayoo use message send for total and discount values

cus_mob = textBox13.Text;

string strUrl = "http://api.mVaayoo.com/mvaayooapi/[email protected]:fsstanly&senderID=raja&receipientno=";

string bal_strUrl = "&msgtxt=Your order is successfully delivered.&state=4";

string new_strUrl = strUrl + cus_mob + bal_strUrl;

WebRequest request = HttpWebRequest.Create(new_strUrl);

HttpWebResponse response = (HttpWebResponse)request.GetResponse();

Stream s = (Stream)response.GetResponseStream();

StreamReader readStream = new StreamReader(s);

string dataString = readStream.ReadToEnd();

response.Close();

s.Close();

readStream.Close();

this is my code

only sms sent

how to total and discount values to sms

help pls!