The ViewState is persistent on callbacks.

Add a new contact to the contacts list.
The contacts list is stored in ViewState object.

Add New Contact Name: Phone: Email:

My Contacts List Clear Contacts List

Make dummy postback to the server.

The ViewState object is empty after reloading the page. Reload



See also EnableCallbackViewState property.

Increase the value of ViewState variable using a callback.




Make a real postback to the server.
You will see the ViewState variable value, updated according to the last callback.



ViewState value = 1


See also EnableCallbackViewState property.