Server side form submit

I just thinking how i can hidden all the parameter of html form, e.g:
<input type="hidden" name="test1" value="test1"
As i know, J2EE can do the server side form submit..

How's the ASP.NET implementation?

Urgent! Thank you very much!!most hidden field uses are done away with by just using the ViewState, but if you must create one, you can use this code.

Page.RegisterHiddenField("myFieldName", "myFieldValue")