how send sms using api

protected void btnSend_Click(object sender, EventArgs e)

    {

       

        HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://www.sitename.in/pushsms.php?UserName=abc&Password=xyz&Type=Individual&To=" + txtMobileNo.Text + "&Mask=S H A M &Message=" + txtMessage.Text) as HttpWebRequest;

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

        Stream receiveStream = response.GetResponseStream();

        Encoding encode = System.Text.Encoding.GetEncoding("utf-8");

        StreamReader readStream = new StreamReader(receiveStream, encode);

        string a = readStream.ReadToEnd().ToString();

        response.Close();

        readStream.Close();

    }

    #region characters as byte array

   

    public string UTF8ByteArrayToString(byte[] characters)

    {

        UTF8Encoding encoding = new UTF8Encoding();

        string constructedString = encoding.GetString(characters);

        return constructedString;

    }

    #endregion