how to "Add"/edit/delete record in this type of xml in asp.net with C#

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C#

ASP.NET

XML

web_development

Please help me,
I am new on xml and i know little information in xml. Please any one help me to Add/ Edit/ Delete on Xml file Record.
This XML File Contain Gallery Data.
User can want to add, edit, delete record in xml file. using a web base graphical environment.

user can add new Category, and edit and delete any category.

i want to edit those part type in xml file.

<category name="GIET Building">
        <image>
            <date>12.31.2011</date>
            <title>GIET Gallery</title>
            <desc>GIET Gallery</desc>
            <thumb>building1.JPG</thumb>
            <img>building1.JPG</img>
        </image>
        <image>
            <date>12.31.2011</date>
            <title>GIET Gallery</title>
            <desc>GIET Gallery</desc>
            <thumb>building2.jpg</thumb>
            <img>building2.jpg</img>
        </image>
        </category>

this is xml source file contain these type of data.

<gallery title="GIET Album" thumbDir="gallery/thumb/" imageDir="gallery/" random="true">
    <category name="GIET Building">
        <image>
            <date>12.31.2011</date>
            <title>GIET Gallery</title>
            <desc>GIET Gallery</desc>
            <thumb>building1.JPG</thumb>
            <img>building1.JPG</img>
        </image>
        <image>
            <date>12.31.2011</date>
            <title>GIET Gallery</title>
            <desc>GIET Gallery</desc>
            <thumb>building2.jpg</thumb>
            <img>building2.jpg</img>
        </image>
        </category>
        <category name="Receiption">
        <image>
            <date>12.31.2011</date>
            <title>GIET Gallery</title>
            <desc>GIET Gallery</desc>
            <thumb>reception1.JPG</thumb>
            <img>reception1.JPG</img>
        </image>
        </category>

</gallery>