Answer / swapna

Enable ViewState turns on the automatic state management
feature that enables server controls to re-populate their
values on a round trip without requiring you to write any
code.

This feature is not free however, since the state of a
control is passed to and from the server in a hidden form
field.

You should be aware of when ViewState is helping you and
when it is not. For example, if you are binding a control
to data on every round trip, then you do not need the
control to maintain it's view state.

ViewState is enabled for all server controls by default. To
disable it, set the EnableViewState property of the control
to false.

Answer / kumar saurabh

Enable ViewState turns on the automatic state management feature that enables server controls to re-populate their values on a round trip without requiring you to write any code. This feature is not free however, since the state of a control is passed to and from the server in a hidden form field. You should be aware of when ViewState is helping you and when it is not. For example, if you are binding a control to data on every round trip, then you do not need the control to maintain it's view state, since you will wipe out any re-populated data in any case. ViewState is enabled for all server controls by default. To disable it, set the EnableViewState property of the control to false.

i have a register form & in that form i have a 2 textboxes for entering name&age.my doubt is that how can i provide error message like "invalid entry" when user enter a invalid name/age(eg:user enter name as #%%%##daff,and age as 1000.)in that textboxes.I want code.

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