Typical Technical Questions (3) XML questions: Multithreading questions: How we execute multiple tasks in the same time in C#? What is the difference between DOM, SAX and StAX parsers for XML? How you use DOM in C# / Java / PHP? What is XPath and how it works? Give an example. How you use Xpath in C# / Java / PHP? You have to download 500 files from Internet but your network bandwidth is not too wide to handle 500 downloads simultaneously so you want to download the files by 10 at a time. How you implement this?