If you just have lucene indexing enabled for your staging sandbox, you could run a lucene query to fetch the list. I believe the properly you'll want to query for is cm:modified
Thanks for the reply friend. Yes I got throught the modified contents through lucene query. to execute the query, we need the store object also.
Can anyone tell me how to filter the deployed contents from the modified contents. Because I need to retrieve only the modified contents which are deployed. Not the contents which are not deployed.