1. is codeproject is a database driven site?
Yes.
2. If codeproject is a database driven site then why its pages are like static pages?
The question/votes/comments/solutions are all stored in the database. the page is built dynamically, and I bet they use URL rewriting so that it shows up like it does.
3. If codeproject is a not a database driven site then How it manage all the site (Insertion, deletion, Updation etc)?
N/A.
If you go to the
Site Bugs and Suggestions[
^] forum, and ask the question there, Chris may tell you how he does it.