asp.net - VB.net Findcontrol Not Working -

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simple findcontrol not working - kicking back:

system.nullreferenceexception: object reference not set instance of object.

i've got asp.net label on web page. 

<asp:label id="lblmenuitemname1" runat="server" text="label"></asp:label>

the label control not inside other control (datagrid, repeater, etc). calling code on button click.

dim lblmenuitemname label lblmenuitemname = ctype(page.findcontrol("lblmenuitemname1"), label) lblmenuitemname.text = "hello"

i've tried (and half dozen of scenarios):

lblmenuitemname = findcontrol("lblmenuitemname1") lblmenuitemname = me.findcontrol("lblmenuitemname1")

i'm doing this, instead of referencing control directly, because i've got ten of these labels , i'm going assign text through loop using

findcontroll("lblmenuitemname" & x.tostring)

fyi - referencing control directly works fine.

 lblmenuitemname1.text = "hello"

where going wrong?

update: i've discovered problem (thanks comments below) problem control in content control. looking find out how reference label within content control. like:

 dim x content = me.findcontrol("content3")  dim lblmenuitemname label = x.findcontrol("lblmenuitemname1")  lblmenuitemname.text = "hello"   <asp:content id="content3" contentplaceholderid="contentbody" runat="server"> <asp:label id="lblmenuitemname1" runat="server" text="label"></asp:label><br /><br /> <asp:button id="button1" runat="server" text="button" />

after several hours , dozens of trial , error, here looking for:

    dim lblmenuitemname label = trycast(master.findcontrol("contentbody").findcontrol("lblmenuitemname1"), label)

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