Question

I am new in XML parsing. I have a Xml File and i need to extract some element from this xml and create a new xml file with these selected element and some extra element.

what do i need to understand before start this and how to do it.?

Answer 1

LINQ to XML makes this very easy. For example, this will copy all the foo elements from existing.xml into new.xml under an imported element, creating an other element at the same time:

XDocument oldDoc = XDocument.Load("existing.xml");
var elementsToCopy = oldDoc.Descendants("foo");

var newDoc = new XDocument(
    new XElement("root",
        new XElement("imported", elementsToCopy),
        new XElement("other")
    )
);
newDoc.Save("new.xml");

While XSLT (suggested elsewhere) would quite possibly work very well, I’ve always found it somewhat fiddly to use – and I’d prefer not to have to learn another language for something I can achieve easily within C#. YMMV.