asp.net - Response.Redirect, keep tabcontainer on active tab -

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my vb.net tabcontainer needs stay on active tab when have each submit going through response.redirect.

how can achieve this? need response.redirect there because show has been added in main tab container.

<asp:tabcontainer runat="server" activetabindex="0" height="200px"  width="175px" scrollbars="auto" enabletheming="true" font- underline="false" id="tabcontainer2" enableviewstate="false"  style="float:right; padding-left: 110px; margin-bottom: 340px;"  onactivetabchanged="tabcontainer1_activetabchanged">   protected sub tabcontainer1_activetabchanged(byval sender object,  byval e eventargs)     viewstate("activetabidx") = tabcontainer1.activetabindex end sub   protected sub submitcompanies_click(byval sender object, byval e  system.eventargs) handles submitcompanies.click *****there more code here question, it's not necessary has been  omitted*****     response.redirect(request.rawurl)     viewstate("activetabidx") = tabcontainer1.activetabindex   protected sub page_load(byval sender object, byval e system.eventargs)  handles me.load productid.value = request.querystring("id") page.response.cache.setcacheability(httpcacheability.nocache) if not viewstate("activetabidx") nothing     tabcontainer1.activetabindex = convert.toint32(session("activetabidx")) end if end sub

viewstate won't work response.redirect. current implementation, use querystring or session store reference active tab. 

response.redirect(string.format("{0}?tab={1}", request.rawurl, tabcontainer1.activetabindex))

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