title: Updating the XML without deleting its contents
body: <p>I have developed lot of testcases, each testcase generates xml, output xml of one testcase become input xml for other testcase. I want all testcases should read data from a single xml file.There is a need to update the xml without deleting its current content or creating a new one....is it possible to do this??? Thanks in advance. Technology preferred is .net linq(my team forces to use this)</p>
  
  <p>The testcases are unit test cases developed in c#</p>