xml

[C# Programming]

Hi,
I have an xml file with about 50, 000 records.
Each record has a lot of hierarchy i.e. elements, sub-elements...
I would like to be able to do the following i.e.

1-search for a value in one of the elements
2-delete a row i.e. a sub-element in an element
3-modify a row

What is the best way to start this with?
Should I use xmlDocument?

Thanks