Create and Read and Modify Xml Document using C# and Javascript

1.How many ways are there to create a XML Document using c# with windows forms.

2.How many ways are there to read a created XML document and modify it , add a node at the last .

Kindly use an example to Explain.

A sample XML Document is below.

<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<Contacts>
	<contact>
		<id>1</id>
		<name>Vedh</name>
		<contactno>9876543210</contactno>
		<address>HYD</address>
	</contact>
</Contacts>