C# XML posted to an .aspx page, How to retreive using REQUEST

Hi,
Here are two scenerios. One with .aspx Page and the Other with .asmx(web service)
Let me start with .aspx Page First.
I am posting an SOAP XML Doc from my Peoplesoft page to my .aspx page("sample.aspx").
In my "sample.aspx"  How do I get the posted XML. How do I retreive the Posted XML.

I am using the following code in my "sample.aspx" and it works fine, but it has a set location for my XML File.
I donot want to give the Location, it will be comming in as a Request from Peoplesoft.

XmlDocument doc = new XmlDocument();
doc.Load("http://localhost/sampleproject/sample.xml");
XmlElement firstCD =(XmlElement) doc.DocumentElement.FirstChild;
XmlElement artist  = (XmlElement) firstCD.GetElementsByTagName("artist")[0];
XmlElement title   = (XmlElement) firstCD.GetElementsByTagName("title")[0];
XmlElement jaber   =  (XmlElement) firstCD.GetElementsByTagName("name")[0];
Response.Write (artist.InnerText);
Response.Write (title.InnerText);
Response.Write (name.InnerText);


The XML from peoplesoft looks like this
<?xml version="1.0"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
  <SOAP-ENV:Body>
    <Synchronize xmlns="http://www.tempuri.org/Synchronize">
      <fieldArray>
        <artist>0</artist>
        <title>000</title>
        <name>A</name>
      </fieldArray>
    </Synchronize>
  </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

This above works fine, But the only thing is I cannot give the location of the XML file.
It will be comming as an Request.
How do I get that POSTED XML to this page using Request Object or whatever object....
The code for the aspx page is in C#.

2nd SCENERIO USING WEB SERVICE
I am posting the same SOAP XML Doc from my Peoplesoft page to my .asmx("sample.asmx").
In my "sample.asmx"  How do I get the posted XML. How do I retreive the Posted XML same as above
agian I am using C#

Your help is appreciated
Thanks