How do I write the WebMethod() to generate the "The SOAP response" like below ?

I am having trouble writing a SOAP response.

I can write the SOAP WebMethod, which looks like the "A SOAP request" indicated below.
<WebMethod()> _
    Public Function GetStockPrice(StockName As String) As String
        Return "<m:Price>34.5</m:Price>"
    End Function

I don't know how to write the WebMethod() to generate this...
<m:Price>34.5</m:Price>


---> How do I write the WebMethod() to generate the "The SOAP response" like below ?


Reference:
http://www.w3schools.com/soap/soap_example.asp


A SOAP request:
POST /InStock HTTP/1.1
 Host: www.example.org
 Content-Type: application/soap+xml; charset=utf-8
 Content-Length: nnn
 <?xml version="1.0"?>
 <soap:Envelope
 xmlns:soap="http://www.w3.org/2001/12/soap-envelope"
 soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding">
 <soap:Body xmlns:m="http://www.example.org/stock">
   <m:GetStockPrice>
     <m:StockName>IBM</m:StockName>
   </m:GetStockPrice>
 </soap:Body>
 </soap:Envelope>


The SOAP response:
HTTP/1.1 200 OK
 Content-Type: application/soap+xml; charset=utf-8
 Content-Length: nnn
 <?xml version="1.0"?>
 <soap:Envelope
 xmlns:soap="http://www.w3.org/2001/12/soap-envelope"
 soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding">
<soap:Body xmlns:m="http://www.example.org/stock">
   <m:GetStockPriceResponse>
       <m:Price>34.5</m:Price>
   </m:GetStockPriceResponse>
 </soap:Body
 </soap:Envelope>


---- end ---