close a textfile and save it without the save file dialog andi might change the view but when i clos

Id like to close a textfile and save it without the save file dialog.. do you use try catch (direct code would be handy) and my program changes the text on the view.. but if you call IsModified on the document it says it isnt changed... how do i update the document ??? that is... i might change the view but when i close the doc it dosent save.... please help URGENT