I am developing a sharepoint site in which I have placed a list of the attributes which when user will select it will pass that parameter to the trend webpart available.
This is the sharepoint internal function, but a little bit difficult to explain. I suggest you could call OSIsoft Techsupport team, they could give you a remote session to show how to achieve your goal. Believe me, that is easy when you see the show, but will difficult just by telling you how to do without any picture.
Thanks for your reply I want to clear one thing that the list of the attribute is a customized one which we have develope it our own in a grid view that is not a PI webpart,I have seen passing parameter between two webparts but for customized one I need help
Have you tried searching in the forums before posting?
It's customary to search any kind of forums before starting a new thread, chances are somebody asked this before you. You should be able to find everything you need through the search results, which I see include a white paper from the library/training documentation, a blog post or two, and several forum threads.
Hopefully this will get you started:
Retrieving data ...