form parameters from content page

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ASP.NET

I need to pass only few parameters in form action.

currently, when i use Master/Content page functionality, i give form in master page..
and when i give <input type="submit" > in content page, i need to send only content page parameters as urlparameters , and not all other


also, how to remove parameters like
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUINjU2OTY4MTUPZBYCZg9kFgICAQ8WBh4GYWN0aW9uBUhodHRwOi8vc3RhZ2luZy5hbWFkZXVzZXBvd2VyLmNvbS9kZW1vL3BvcnRhbHMvZGVtby9mbGlnaHRmYXJlc2VhcmNoLmFzcHgeBm1ldGhvZAUDR0VUHgZ0YXJnZXQFC0ZsaWdodEZyYW1lZGS22KAh4T+5kL+TdXOB9k8IgqUqQw==" />

and other.how to do this


Or can i have form inside <form id="formva" runat="server">