asp.net - How to get value of control programmaticaly created, before postback erase them ? -

i'm creating dynamic controls via code

'    fields array of string     each field string in fields             if field.trim <> ""                 fieldqty += 1                  dim mylab new label                 mylab.text = field                 mylab.id = "lblinfo" & fieldqty                   dim mytxt new textbox                 mytxt.id = "txtinfo" & fieldqty                   paninfo.controls.add(mylab)                 paninfo.controls.add(mytxt)              end if   next    session("fieldsqty") = fieldqty  

then, i've button want save or send via email content of fields.

protected sub btnsave_click(sender object, e eventargs) handles btnsave.click           k integer = 1 cint(session("fieldsqty"))                     dim mytxt textbox                     dim mylbl label                     lblmsg.text = paninfo.controls.count 'here got 0                       mylbl = ctype(paninfo.findcontrol("lblinfo" & k), label)  'here mylbl = nothing                     mytxt = ctype(paninfo.findcontrol("txtinfo" & k), textbox) 'here mytxt = nothing        next k      end sub 

it seems after click button controls disappear (not value: both value , controls).

i know these controls dinamically created, not re-create after postback, after click button disappear , can't neither save value in it. why ?

thanks

edit: ok i've question: how value of control on button click?