Hi,

I tried to override __viewsate hidden field value by this.ClientScript.RegisterHiddenField("__VIEWSTATE", ""). I found that, the outputted html contains 2 _VIEWSTATE. One of them with carriage return prefix as ID. Any ideas?

<input type="hidden" name="__EVENTTARGET" id="__EVENTTARGET" value="" />
<input type="hidden" name="__EVENTARGUMENT" id="__EVENTARGUMENT" value="" />
<input type="hidden" name="__VIEWSTATE_KEY" id="__VIEWSTATE_KEY" value="VIEWSTATE_127.0.0.1633813849803125000" />
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="" />
<input type="hidden" name="__VIEWSTATE" id="
__VIEWSTATE" value="" />

 Doing this will cause very strange behaviour indeed, if it works at all. The viewstate value is managed by ASP.NET and should not be directly manipulated (in fact, ASP.NET validates it by default to make sure nobody does).

You can turn viewstate off, either at the page or application level, but I can't think of any good reason to try to alter it.

I agree with booler on this, don't change the viewstate like you are suggesting.

If you need to use it so a user doesn't lose a variable on the page (or object), then set it in the code behind:

ViewState("someName") = "whatever";

Zath

You should not modify ViewState in this way since it contains all the values for the controls and you may end up overriding the values.