You can use the ViewStateMode property to enable view state for an individual
control even if view state is disabled for the page.
Control.EnableViewState gets or sets a value indicating whether the server control persists its view state,
and the view state of any child controls it contains, to the requesting client
disable view state for a page but enable it for a specific control on the page,
set the EnableViewState property of the page and the control to true, set the
ViewStateMode property of the page to Disabled, and set the ViewStateMode property
of the control to Enabled.
The default value of the ViewStateMode
property for a page is Enabled. The default value of the ViewStateMode property
for a control in a page is Inherit. As a result, if you do not set this property
at either the page or the control level, the value of the EnableViewState property
determines view-state behavior.
The ViewStateMode property of a
page or a control has an effect only if the EnableViewState property is set to
true. If the EnableViewState property is set to false, view state will be turned
off even if the ViewStateMode property is set to Enabled.
correct way to handle enabling ViewState only on a checkbox would be:
Leave EnableViewState="true" (the default) everywhere.
ViewStateMode="false" on master page. This way each derived page and
control inherit ViewStateMode and do not output viewstate.
3. Enable viewstate
only on the checkbox by setting ViewStateMode="true".