hi,i am opening a file and the puting some content and then making some changes to it.i have to write the orginal data as well as the changed contents(say as updata) to the file.how can i achive this.
(i am opening a file and puting some content on the screen.then making some changes.then the file should be saved with the old data as well as the new data. what i ahve to do?)

thanks in advance.
dev