The remote server returned an error: (503) Server Unavailable.

 using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net.Mail;
using System.Net;
using System.IO;

public partial class Default4 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        

    }

    public void sendSMS(string uid, string password, string message, string no)
    {
        HttpWebRequest myReq =
        (HttpWebRequest)WebRequest.Create("http://ubaid.tk/sms/sms.aspx?uid=" + uid + "&pwd=" + password + "&msg=" + message + "&phone=" + no + "&provider=way2sms");

        HttpWebResponse myResp = (HttpWebResponse)myReq.GetResponse();
       // request.Proxy = GlobalProxySelection.GetEmptyWebProxy(); 
        System.IO.StreamReader respStreamReader = new System.IO.StreamReader(myResp.GetResponseStream());
        string responseString = respStreamReader.ReadToEnd();
        respStreamReader.Close();  
        myResp.Close();
    }



    protected void Button1_Click(object sender, EventArgs e)
    {
        
            sendSMS("8985389809", "1435", txtmsg.Text, txtno.Text);
            ScriptManager.RegisterStartupScript(this, this.GetType(), "popup", "alert('sms sent successfully...');", true);
       
       
    }
       
}