Hi,
general rule is that those properties that are posted by default by the
control, are not persisted in ViewState weheras those proeprties that can't
be maintained without ViewState mechanism are again persisted through it.
TextBox's Text is an example of property that is posted automatically.
ViewState is used with it, but to detect if the value ahs been changed since
last postback (which is informed by raising TextChanged event). Sae idea is
with DropDownList, SelectedItem and SelectedIndexChanged event.
--
Teemu Keiski
MCP, Microsoft MVP (ASP.NET), AspInsiders member
ASP.NET Forum Moderator, AspAlliance Columnist
"xu" <> wrote in message
news:...
> Thank your reply.
>
> I want to know what properties of a control will be need to re-initialize
by
> programmer,what properties of a control will be assigned by viewstates or
> postback-date automatically when a page are postbacking.
>
>
> "Joao S Cardoso [MVP]" <-m> 写入消息新闻
> :...
> > Can u please rephrase that? Not sure if I got it right...
> >
> > If you are loking for the option for the state on a dropdownlist to be
> stored on
> > viewstate then what you are looking for is the enableviewstate property.
> This is
> > a common property in webcontrols.
> >
> > Joao Cardoso (MVP dotNET)
> > ================================================== =====
> > [LusoCoders]- http://groups.yahoo.com/group/lusocoders/
> > [PontoNetPT]- http://www.programando.net/regras.aspx
> > .n.o-s.p-a.m - www.acinet.pt
> > ================================================== =====
>
>