When closing a Windows Form is there a best practice for disposing of the Diagram and DiagramView instances?  Do I have to explicitly do this?  When opening and closing a large number of files and creating these objects I start to get low on memory, so it seems I'm not disposing of something correctly!

Any help gratefully received.

David

Hi,

Check if there aren't some variables left in the application pointing to DiagramView, Diagram or any nodes/links. You should be able to find what prevents GC from disposing of objects using VS Diagnostic Tools -> Memory Usage -> Take Snapshot. Call that after closing your form, click View Heap and find if there's any DiagramView instance left. Select it and check the 'Paths to Root' pane - items showing [Cycle Detected] are safe, while ones leading to variables in parent form or some static references need to be cleared.

Regards,
Slavcho
Mindfusion

Thanks for your help.  It seems that I am hanging on to a reference to the whole Form that contains the DiagramView.  The 'Paths to root' pane does not seem too helpful, so I might try a different memory diagnostic tool or revisit the problem another day!

Thanks again
David

Edit: 'Paths to root' was actually useful, I just didn't know what I was looking at! The problem is the many event handlers that have a reference to the form - apparently a know problem.