How to pass query string into Xml file and send sms ?

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C#

ASP.NET

XML

C#4.0

Dear Sir,


This is Xml Code below

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE MESSAGE SYSTEM "http://127.0.0.1:80/psms/dtd/messagev12.dtd">
<MESSAGE VER="1.2">
<USER USERNAME="" PASSWORD=""/>
<SMS  UDH="0" CODING="1" TEXT="" PROPERTY="0" ID="1">
<ADDRESS FROM="" TO="" SEQ="1" TAG="some clientside random data"/>
</SMS>
<SMS UDH="0" CODING="1" TEXT="Client API version 1.2 testing msg" PROPERTY="0" ID="2">
<ADDRESS FROM="" TO="" SEQ="1" TAG="" />
</SMS>
</MESSAGE>

I want to send sms through above xml code.Above xml code is my api.
I work web application .
I will send sms in asp.net C#.
What is code in asp.net C# and send message in mobile .
This is URL address ="http://api.myvaluefirst.com/psms"


Asp.net Code

String Mob = "91" + txtMobile.Text;
            byte[] data = new byte[2000];
            string msg = "";
            msg = "Congratulation!," + " Dear " + txtAppname.Text + "Distributor ID: " + lblDistributorID.Text + " Password: " + pwd + ".You Successfully Registered ";

            // The encoding.
             ASCIIEncoding encoding = new ASCIIEncoding();
             data = encoding.GetBytes(msg);
             HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create("http://api.myvaluefirst.com/psms?userName=securelynkx1&password=system&To=" + txtMobile.Text + "TEXT=" + msg + " ");

           //  Dim myReq As HttpWebRequest = WebRequest.Create("http://bulksmsindia.mobi/sendurlcomma.asp?user=20023733&pwd=k9ry3i&senderid=ABC&mobileno=" & txtMobNo.Text & "&msgtext=" & msg & "")

             myReq.Method = "POST";
                myReq.ContentLength = data.Length;
                myReq.ContentType = "application/x-www-form-urlencoded";
                 System.IO.Stream myStream;
                //Dim myStream As System.IO.Stream
                myStream = myReq.GetRequestStream();

                myStream.Write(data, 0, data.Length);
                myStream.Close();

Above code is not work.
How will work .
Please Help me.
Thanks
Mahendra Kumar Das