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Are there any other ViewState alternatives? I've heard a lot Like Session, holding the state of some of the page's controls' state and getting destroyed the moment the user leaves the page.
I know I'm describing ViewState itself, but I'm looking for a pattern of sorts or suggestions so I can avoid ViewState altogether.
An example of how I'm using it is where I'm storing the contents of my grid (A list of ViewModels) to ViewState. This helps to know which entries are dirty, which ones have been modified, their indexes, the currently selected objects, etc.
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View state is the method that the ASP.NET page framework uses to preserve page and control values between round trips. When the HTML markup for the page is rendered, the current state of the page and values that must be retained during postback are serialized into base64-encoded strings.
The view state is a key element of an ASP.NET page because it is the primary means to persist the state of the Web server controls. Whenever the page posts back, the state is restored, updated using the current form parameters, then used to run the postback event handler.
ASP.NET MVC does not use ViewState in the traditional sense (that of storing the values of controls in the web page). Rather, the values of the controls are posted to a controller method. Once the controller method has been called, what you do with those values is up to you.
To accomplish our tasks, we use ViewState a lot, but as we know, it doesn't come free - it has a performance overhead. The ViewState is stored on the page in the form of a hidden variable. Its always advised to use the ViewState as little as possible. We also have other ways to reduce the performance overhead.
One of my colleagues has developed a way to store viewstate data in a file. So that, heavy viewstate data are not transmitted between client and server. Just a key (which is the viewstate data file) that represents the viewstate data file is held as a session variable. In our tests, we've found that saving viewstate in file decreased the server response time by decreasing the amount of viewstate (which was very huge then).
In this article under "Keeping View State on the Server", you can find out how that method can be implemented. You can even store viewstate data in a database table, which gives extra flexibilty if your application is on a web farm.
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