How to edit, update or delete particular node in a xml file using c#

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C#

ASP.NET

XML

Here is a xml file

<CarsService>
  <make name="AAA">
    <model name="ssss">
      <color name="Red" />
    </model>
    <model name="qqqq">
      <color name="Green" />
    </model>
  </make>
  <make name="AAB">
    <model name="aaaa">
      <color name="Black" />
    </model>
  </make>
  <make name="AAC">
    <model name="dddd">
      <color name="Blue" />
    </model>
  </make>
</CarsService>

If i want to insert a new node inside the existing node how to write that?
Suppose i want to insert a color node which has a attribute say Pink in make node "AAA" and model node "qqqq".
How to do that?

If i want to modify any of sub node; how should i do that? even to delete some specific node or sub node how to do that also?

Thanks in advance.