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Is it possible to execute code line by line seeing what values are being passed at each line like you can in Visual Basic
I want to step into the code running on a VF page to see why a section is rendering when I dont think it should be - how can I do this ?
as far as I know it is not possible to debug visual force code like you mentioned or like using Eclipse and Java JSP.
So the only way to "debug" your code is to display the variables values on the visual force page using the message class:
http://www.salesforce.com/us/developer/docs/pages/Content/apex_pages_message.htm
This also might help you:
https://www.linkedin.com/groups/Is-there-any-way-debug-3774731.S.81380237
Best Regards
Robert