ASP.NET

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(Name = "TestService", ConformsTo = WsiProfiles.BasicProfile1_1)]
public class WebService : System.Web.Services.WebService {
    // Add a member variable of the type deriving from SoapHeader.
    public MyHeader timeStamp;

    // Apply a SoapHeader attribute.
    [WebMethod(Description = "A method that requires authentication")]
    [SoapDocumentMethod(Binding = "TestService")]
    [SoapHeader("timeStamp", Direction = SoapHeaderDirection.In)]
    public string HelloWorld()
    {
        if (timeStamp == null)
            timeStamp = new MyHeader();

        //timeStamp.MustUnderstand = true;
        //timeStamp.Expires = 60000;
        //timeStamp.Created = DateTime.UtcNow;

        return "Hello World";
    }

    [WebMethod(Description = "A method that requires authentication")]
    [SoapDocumentMethod(Binding = "TestService")]
    [SoapHeaderAttribute("timeStamp", Direction = SoapHeaderDirection.InOut)]
    public XmlNode GetXML()
    {
        XmlDocument doc = new XmlDocument();
        doc.LoadXml("<bookstore>" +
                    "<book genre='novel' ISBN='1-861001-57-5'>" +
                    "<title>Pride And Prejudice</title>" +
                    "</book>" +
                    "</bookstore>");
        return doc;
    }

=---client call ----
protected void Page_Load(object sender, EventArgs e)
    {
        localhost.MyHeader header = new localhost.MyHeader();
        header.UserName = "test";
        header.Password = "test";
        localhost.WebService proxy = new localhost.WebService();
        proxy.MyHeaderValue = header;
        XmlDocument xmlDoc = new XmlDocument();
        XmlNode elem = proxy.GetXML();
        XmlNodeReader nodeReader = new XmlNodeReader(elem);
        xmlDoc.InnerXml = elem.InnerXml;
        string strXML = xmlDoc.InnerXml;
}
---output is---
<book>book genre='novel' ISBN='1-861001-57

---i want output in---

<soap:envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:header>
    <myheader xmlns="http://tempuri.org/">
      <username>string
      <password>string
    
  
  <soap:body>
    <getxml xmlns="http://tempuri.org/">