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I want to know the best way to parse XML , i.e in terms of performance (space and time).
I have done parsing through the following methods
Without seeing your code, it is not easy to optimise it. However, there is one general point you should consider:
Linq-to-XML is a DOM-based parser, in that it reads the entire XML document into a model which resides in memory. All queries are executed against the DOM. For large documents, constructing the DOM can be memory and CPU intensive. Also, your Linq-to-XML queries, if written inefficiently can navigate the same tree nodes multiple times.
As an alternative, consider using a serial (SAX) parser like XmlReader. Parsers of this type do not create a memory-based model of your document, and operate in a forward-only manner, forcing you to read each element just once.