Send SMS URL

protected void btnBounces_Click(object sender, EventArgs e)
{
    try
    {
        string host = "https://sms.dialbox.com.co:52291";
        string salt_token = "PassworsdFuerteEnviadoEnLaDocumentaicon";
        string metodo = "sms/dcti";
        string pbx_id = "10";
        string device = "*gmovistar";
        string telefono = "39999999";
        string mensage = Server.URLEncode("Gracias Por Contactarnos..") 
        string url = host + "/" + salt_token + "/" + metodo + "/" + pbx_id + "/" + device + "/" + telefono + "/" + mensage
        // Llamar al API Rest Dialbox DCTI  
        GetResult(url);
    }
    catch (Exception ex)
    {
        lblError.Text = ex.Message.ToString();
    }
}


public void GetResult(string url)
{
    WebRequest myReq = WebRequest.Create(url);
    myReq.Method = "GET";
    UTF8Encoding enc = new UTF8Encoding();
    WebResponse wr = myReq.GetResponse();
    Stream receiveStream = wr.GetResponseStream();
    StreamReader reader = new StreamReader(receiveStream, Encoding.UTF8);
    string content = reader.ReadToEnd();
    Response.Write(content)
}