Visual Studio 2010 has a neat feature that allows you to generate sequence diagrams. I haven't spent a lot of time with it, but I gave it a quick spin on a sample ASP.NET MVC 2 Controller Action responsible for displaying a list of featured products from a product catalog.
I right-clicked on the FeaturedProducts Action in the Products Controller and a Generate Sequence Diagram is available on the context-sensitive menu:
After you select Generate Sequence Diagram from the menu another screen pops up requesting a few options as to the depth of the diagram and the scope of the objects to be included in the diagram. Once you set the options, a neat sequence diagram is displayed and added to your Visual Studio 2010 Solution:
This is particularly useful if you are looking at someone else's code and/or looking at code you haven't touched in awhile. The only thing I didn't see is how to export the diagram. I happen to have a printer driver that creates a PDF, but I was hoping for an option built-in to Visual Studio 2010 that exports it to PDF, HTML, and other options. I may uncover it with a little digging.
Exporting aside, sequence diagrams are a nice addition to Visual Studio 2010.
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