insert, delete, edit and search data in xml asp.net webform

Question

Hi, I want to perform insert, delete, edit and search data in xml asp.net webform
Please help me!

Code XML

<?xml version="1.0" standalone="yes"?>

<DienThoai>

  <Sdt so="0978525952" tenmang="Vietel" />

  <Sdt so="0989999999" tenmang="Vietel" />

  <Sdt so="0988888888" tenmang="Vietel" />

  <Sdt so="0988888888" tenmang="Vietel" />

  <Sdt so="0988888888" tenmang="Vietel" />

  <Sdt so="0988888888" tenmang="Vietel" />

  <Sdt so="0988888888" tenmang="Vietel" />

  <Sdt so="0988888888" tenmang="Vietel" />

  <Sdt so="0988888888" tenmang="Vietel" />

  <Sdt so="0988888888" tenmang="Vietel" />

  <Sdt so="0988888888" tenmang="Vietel" />
</DienThoai>