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

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ASP.NET

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("9966557790", "******", txtmsg.Text, txtno.Text);
       ScriptManager.RegisterStartupScript(this, this.GetType(), "popup", "alert('sms sent successfully...');", true);
   }

we will write asp.net through C# code send message to mobile through way2sms.com . we will get This error (The remote server returned an error: (503) Server Unavailable.). Please Replay me