post soap request and responce

Question

HttpWebRequest hwRequest;
HttpWebResponse hwResponse;
System.IO.StreamReader sReader;
XmlDocument xmlDoc = new XmlDocument();
int iTimeout = 1;
System.Text.Encoding encode = System.Text.Encoding.GetEncoding("utf-8");// Pipes the stream to a higher level stream reader with the required encoding format.
System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();
string strXMLRequest = @"<?xml version='1.0' encoding='UTF-8'?>" +
@"<SOAP-ENV:Envelope xmlns:SOAP-ENV='http://schemas.xmlsoap.org/soap/envelope/'" +
@" xmlns:eb='http://www.ebxml.org/namespaces/messageHeader' xmlns:xlink='http://www.w3.org/1999/xlink' " +
@" xmlns:xsd='http://www.w3.org/1999/XMLSchema'> " +
@" <SOAP-ENV:Header/> " +
@" <SOAP-ENV:Body> "+
@" <DSAvailableHotelRQPL xmlns='urn:Hotel_Search' "+
@" xmlns:xs='http://www.w3.org/2001/XMLSchema' " +
@" xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' PrimaryLangID='en-us' AltLangID='en-us'> "+
@" <POS> "+
@" <Source Username='ID' Password='PWD' PropertyID='ID' /> " +
@" </POS> "+
@"<AvailRequestSegments> "+
@"<AvailRequestSegment> "+
@" <StayDateRange Start='2009-09-05T12:00:00' End='2009-09-06T12:00:00'/> "+
@" <RoomStayCandidates> "+
@" <RoomStayCandidate> <!--for Room 1--> "+
@" <GuestCounts> "+
@" <GuestCount Count='2'/> "+
@" </GuestCounts> "+
@" <ChildCounts> <!--if no child is selected skip this node --> "+
@" <ChildAge Age='10'/> "+
@" <ChildAge Age='09'/> "+
@" </ChildCounts> "+
@" </RoomStayCandidate> "+
@" <RoomStayCandidate> <!--for Room 2--> "+
@" <GuestCounts> "+
@" <GuestCount Count='2'/> "+
@" </GuestCounts> "+
@" <ChildCounts><!--if no child is selected skip this node --> "+
@" <ChildAge Age='10'/> "+
@" <ChildAge Age='09'/> "+
@" </ChildCounts> "+
@"</RoomStayCandidate> "+
@" </RoomStayCandidates> "+
@" <HotelSearchCriteria> "+
@" <Criterion> "+
@" <HotelRef HotelCityName='CITY' HotelName='' Area='' Attraction='' Rating=''/> "+
@" <Sorting Preference='2'/> "+
@" <ResponseType Compact='Y'/> "+
@" </Criterion> "+
@" </HotelSearchCriteria> "+
@" </AvailRequestSegment> "+
@" </AvailRequestSegments> "+
@" </DSAvailableHotelRQPL> "+
@" </SOAP-ENV:Body> "+
@" </SOAP-ENV:Envelope> ";
 
XmlDocument soapEnvelopeXml = new XmlDocument();
soapEnvelopeXml.LoadXml(strXMLRequest);
string strWebServiceURL = "http://XYZ.com/default1.aspx";
hwRequest = (HttpWebRequest)HttpWebRequest.Create(strWebServiceURL);
hwRequest.Headers.Add("SOAPAction", "http://test.abc.com/soap/testing/TestWebservice/message");
hwRequest.ContentType = "text/xml; charset=utf-8";
hwRequest.Accept = "text/xml";
hwRequest.Credentials = CredentialCache.DefaultCredentials;
hwRequest.Method = "POST";
hwRequest.Timeout = iTimeout * 1000;
//hwRequest.ContentLength = soapEnvelopeXml.OuterXml.Length;;
using (Stream stream = hwRequest.GetRequestStream())
{
soapEnvelopeXml.Save(stream);
}
hwResponse = (HttpWebResponse)hwRequest.GetResponse();
sReader = new StreamReader(hwResponse.GetResponseStream());
string strXMLReply = sReader.ReadToEnd();
sReader.Close();
xmlDoc.LoadXml(strXMLReply);
Response.Write(xmlDoc.OuterXml);
plz see it
it is not working plz tell me