ADF: clearing all previous data in a page?

Hi Everyone,
im using Jdev 11G.
i have created 9 pages in ADF. i have used navigations to other pages through buttons from the first page.
all pages have data from different VOs.
Now the problem is : when i run the page for the first time it is working fine. but when i go back and run the page second time if data for some particular VO is not there (kept whereclause for VO in backing bean) then it should not display any data but it is displaying previous search data.
plz help to get out of this.
how to clear all the previous data while navigating to the page.
i have used VO.clearcache() methods also but didnt work.
Any ideas wil be really helpful.
Thank you.

Hi Desmukh,
Thanks for ur reply.
im executing the VO queries but if the parameters is not exists in the VO then it returns all the values in the VO.
i have used: vo.setWhereClause("EMP_ID=:empid AND EMP_NAME=:ename");
vo.defineNamedWhereClauseParam("empid ", emp_id1, null);
vo.defineNamedWhereClauseParam("ename",emp_name1, null);
vo.executeQuery();
here emp_id1 and emp_name1 are the values im passing to VO to filter VO.
if these two values doesnt match with any of the values in the VO then it returns allrecords from VO on the page.
Plz help.
Thank you.

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ADF: clearing all previous data in a page?

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