Can someone explain me in details the following question.
1) whats the main difference between top down and bottom up approach in web service?
2) which approach is most suitable and in which condition?
its quite a basic question with respect to web services but i am unable to find any good source giving proper answer to this questions.
Ivan's notes are good. Here is an alternative source. Look at the points 9 and 10 at the bottom of the document. Generally the doc covers useful information for the web services exam and is a terse crammer.