I'm working on my first web application using asp.net MVC, so much to learn but getting my head around it.

one thing im not sure about is the scope of public variables in controllers and static classes

here is an illustration of how i handle changes to header option selctions, and adding new items to order

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Not sure if what im doing is wrong or if there is a better way,but i'm sending options value, and new items back to static collections on the server side and refreshing grid content from server.

will this work in the event of multiple users logged in simultaneously? and how to hold data temporarily on client side?

Thanks in advance