how to send sms throught asp.net

first of all i will let you know one thing
you need to buy an api for that or you can take a demo

this code is working fine in my project

   2:  

   3: protected void btnSendMessage_Click(object sender, EventArgs e)

   4:     {

   5:         string senderusername = "xxxxx";

   6:         string senderpassword = "xxxx";

   7:         string senderid = "xxx";        

   8:         string sURL;

   9:         StreamReader objReader;

  10:         sURL = "http://thundersms.com/smsapps/pushsms.php?username=" + senderusername + "&password=" + senderpassword + "&sender=" + senderid + "&mobile=91" + txtMobileNumber.Text + "&type=1&message=" + txtMessage.Text;

  11:         WebRequest wrGETURL;

  12:         wrGETURL = WebRequest.Create(sURL);

  13:         try

  14:         {

  15:             Stream objStream;

  16:             objStream = wrGETURL.GetResponse().GetResponseStream();

  17:             objReader = new StreamReader(objStream);

  18:             objReader.Close();

  19:         }

  20:         catch (Exception ex)

  21:         {

  22:             ex.ToString();

  23:         }

  24:     }

  25: