What steps will reproduce the problem? 1. Try Passing a String and an object array to the web service; it gives an error of serialization

2. When I try something like a vector class to serialize the same then the soapfaultstring error comes::of object reference not set to instance of an object

3.I cant change the ws method parameters

What is the expected output? What do you see instead?

What version of the product are you using? On what operating system? Tried with 2.4 and 2.6.5;; Windows 7

Also i have to send an object to ws .......how can it be done and can i send a dataset type to a ws...how??

You have to provide more detail. This works but you will have to debug what is going on in your case..