c# - Asp panel visible setting not changing -

i'm trying change visible setting of panel button click. need second panel become visible when button @ bottom of first panel clicked.

<asp:content id="content3" contentplaceholderid="cphcontent" runat="server"> <asp:panel id="pnl1" runat="server">     <asp:gridview id="gv1" runat="server" autogeneratecolumns="false" cellpadding="0"         allowsorting="true" cssclass="grid" visible="true">         <columns>             //gv1 columns here         </columns>     </asp:gridview>     <asp:button id="btnmodadd" class="btn btn-primary" runat="server" text="ekle" onclick="btnmodadd_click">     </asp:button>     <br />     <div class="datatables_paginate" id="example_info">         <uc1:pagingcontrol id="pcbottom" runat="server" pagingposition="top" />     </div> </asp:panel> <br /> <asp:panel id="pnl2" runat="server" visible="false">     <asp:gridview id="gv2" runat="server" autogeneratecolumns="false" cellpadding="0"         allowsorting="true" cssclass="grid" visible="true">         <columns>             //gv2 columns here..         </columns>     </asp:gridview> </asp:panel> 

and c# code of button, quite simple.

public void btnmodadd_click(object sender, eventargs e) {     pnl2.visible = true; } 

i can't understand i'm missing see here...

edit: ok noticed missed add bind method pageload. noob mistake on part well, still learning :)