How to Save The Edited XML into the same file which we read data from

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XML

ASP.NET4

<?xml version="1.0" encoding="UTF-8"?>
<category>
<aaa>
<bbb>
<ccc>
<ddd>
<eee>
<abc>name</abc>
<cde>student</cde>
<fff>
<fgh>phone</fgh>
<hij>address</hij>
</fff>
</eee>

SO i Have Xml as shown above so I have Displayed In the following format

Lable Textbox
abc name
cde student

so i want to save the changes made in the textbox.i am reading and writing is the same
xml file which i am reading.so i have save button on its click event i have save the new changes in the xml document.

Document size is up to 10 mb a large file. xml tag name will not be changed but we have to change a small section in xml file that means only for selected node child elements we have change the xml content and rest of the xml will remain the same.


So i tried but i am getting the solution please give a solution thanks In advance.