How do I turn off viewstate for good?

Question

Coming from a PHP background I love using clean URLs to grab data from one service to another.

However, on some of my ASP.NET projects I get the horrible ViewState parameter in my URLs.

Is there a way to turn this off globally?

What affect will this have on my ASP.NET app?

Answer 1

You can turn off viewstate for the whole site like this:

    <system.web>
<pages enableViewState="false" />

That said, you shouldn't be getting it on the url. ViewState is a hidden field that is sent to the server with a postback (which normally uses post). It keeps the state of the controls when the page was rendered to the client, sending it with each postback. If it works for the application you could switch to use post instead (the problem form is surely using get), if not take a look at Jon's answer.

Check this link for more information on how the viewstate fits into the asp.net life cycle: http://msdn.microsoft.com/en-us/library/ms972976.aspx.

Answer 2

I had a similar question when writing the Reputation Tracker.

I don't know how you do it globally other than to just never use a form with runat="server" set, which is more to do with discipline than a setting. In particular, if you have runat="server" set on a form I believe you'll always get a viewstate parameter, even if you've turned it off everywhere so you don't get any values. That was my experience, anyway.

Obviously this limits you somewhat, but I've found that using the HTML server controls (instead of the ASP.NET controls) for appropriate parts of ASP.NET can make life a lot simpler to understand.