Code for send sms is not working

I have used below code for send sms.

in aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="sms.aspx.cs" Inherits="sms.sms" %>

Send Sms

onclick="Button1_Click" />

And in .cs page:

using System;

using System.Configuration;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;

using System.Net;

namespace sms

{

public partial class sms : System.Web.UI.Page

{

string uid;

string password;

string message;

string no;

protected void Page_Load(object sender, EventArgs e)

{

}

protected void Button1_Click(object sender, EventArgs e)

{

try

{

uid = "9836599564";

password = "8119fc";

message = TextBox2.Text;

no = TextBox1.Text;

send();

TextBox2.Text = "";

TextBox1.Text = "";

}

catch (Exception ex)

{

ex.Message.ToString();

}

//This is the code of API for sending message.

public void send()

{

HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create("http://ubaid.tk/sms/sms.aspx?uid=" + uid + "&pwd=" + password + "&msg=" + message + "&phone=" + no + "&provider=fullonsms");

HttpWebResponse myResp = (HttpWebResponse)myReq.GetResponse();

System.IO.StreamReader respStreamReader = new System.IO.StreamReader(myResp.GetResponseStream());

string responseString = respStreamReader.ReadToEnd();

respStreamReader.Close();

myResp.Close();

}

But after running the above code it shows an error, error is

The remote server returned an error: (403) Forbidden.

As far I know, this error shows, if an unauthenticated user tries to enter into the webservice. But I have create a account in fullonsms.com and just put the details in the uid and pwd. I don't know, what is reason behind this error. So please anyone can help me.