Recently I was making one module and stuck in the viewstate. I was loading controls dynamically and got into bad situation and wish I could see the viewstate.
You can download Viewstate Viewer from This Site.
Also you can get more information about your ASP.NET page by installing Nikhil Kothari’s Web Development Helper.
Following are some features of it:
A warning when either debug or trace have been turned on. Ability to hide trace information from the page, and view it in a separate dialog, so it does not get in the way of your page’s layout.
Ability to view the page’s view state (in various forms: raw, parsed, and decoded) to help you optimize your state management logic.
Ability to view items stored in cache, and remove them for testing purposes.
Ability to shutdown the application (unloading the associated appdomain), in order to test starting it from a clean state.
Ability to log all HTTP (and HTTPS) traffic between the browser and your server, and view request and response details, including those performed via XMLHttpRequest.
Ability to view the live HTML DOM using a DOM Inspector that allows viewing all elements, selected elements, or elements matching ID or CSS class. For each element, you can see the markup, attributes, and style attributes.
Ability to view rich error information for script errors (full call stack, script URL and line number), as well as a script immediate window to execute some script against the current document.