Read/Write to XML in C#

I am new to C#/XML and I am trying to read/update (write to) an XML file with C# with a ASP.NET webpage.  I have developed parts of my webpage and the XML file.  I am trying to figure how i can display the info from the XML file onto my page and also have an Add button on the webpage that will add information to the XML file.

Here is my current XML file

<?xml version="1.0" encoding="utf-8" ?>
<submissions>  
  <submission>
    <resource_name>John Doe</resource_name>
    <resource_type>Manager</resource_type>
    <location>USA</location>
    <start_date>01/01/2008</start_date>
    <end_date>12/31/2008</end_date>
    <hours>40</hours>
    <skill_level>Advanced</skill_level>
    <percent_available>50</percent_available>
    <comments>n/a</comments>
  </submission>
</submissions>

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