asp.net - txtAddress is not declared. I cannot reference TextBox inside of AJAX .NET VB Update Panel -


trying fill few textboxes using ajax, vb .net: 

<div align="left">  <asp:scriptmanager id="mainscriptmanager" runat="server" /> <asp:updatepanel id="pnladdresses" runat="server"> <contenttemplate runat="server"> <asp:dropdownlist id="ddlvenueaddresses" width="264px" height="24px" runat="server" autopostback="true" onselectedindexchanged ="ddlvenueaddresses_selectedindexchanged" cssclass="admin" backcolor="transparent" datatextfield="venuename" datavaluefield="venueaddress"></asp:dropdownlist> (optional)                 <br />                 <input name="txtaddress" id="txtaddress" type="text" size="70" maxlength="100"  value='<%= request.form.get("txtaddress")%>'/>                 <br />                 <input name="txtgoogleaddress" type="text" size="70" maxlength="100"   value='<%= request.form.get("txtgoogleaddress")%>'/>                 <br />                 <input name="txtgooglecity" type="text" size="70" maxlength="100"   value='<%= request.form.get("txtgooglecity")%>'/>                 <br />                 <input name="txtgooglestate" type="text" size="70" maxlength="100"   value='<%= request.form.get("txtgooglestate")%>'/> </contenttemplate> </asp:updatepanel>           </div>     </td>

dropdown list gets populated , when item picked, code stops on breakpoint should. stepping through error when trying add simple "xxxx"s textbox test:

 public sub ddlvenueaddresses_selectedindexchanged(byval sender system.object, byval e system.eventargs)              dim txtaddressfound textbox             txtaddressfound = pnladdresses.findcontrol("txtaddress")              txtaddressfound.text = "xxxxx"          end sub

txtaddressfound null , when trying set "xxxxx" error:

system.nullreferenceexception unhandled user code   hresult=-2147467261   message=object reference not set instance of object.

if trying set txtaddress.text = "xxxx" no findcontrol method, says doesn't exist:

? txtaddress 'txtaddress' not declared. may inaccessible due protection level.

totally lost. application has been working years, wanted use ajax populate address stuff. have ideas? have tons of textboxes on form (not using ajax on them). put @ top under inherits system.web.ui.page no luck.

protected withevents txtaddress system.web.ui.webcontrols.textbox

because trying access client side control txtaddress server side script.

in asp.net, control should 

<asp:textbox id="txtaddress" runat="server" />

this way can access server side.


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