c# - ASP UpdatePanel doesn't work when used in ContentPage -

my code works fine when used in normal webform. when use in webform using masterpages, doesn't work.

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page header : ~/manager/basemanager.master

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and nested master pages : base.master > pages.master > basemanager.master

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asp

<asp:scriptmanager id="scriptmanager1" runat="server"></asp:scriptmanager>    <asp:updatepanel id="updatepanel1" runat="server" updatemode="conditional">       <triggers>          <asp:asyncpostbacktrigger eventname="click"               controlid="btnupdateeditpage" />       </triggers>       <contenttemplate>          <asp:label id="lbltest" runat="server" text="label"></asp:label>       </contenttemplate>    </asp:updatepanel> <asp:button id="btnupdateeditpage" cssclass="btnupdateeditpage" runat="server"        text="button" onclick="btnupdateeditpage_click" /> 

c#

protected void btnupdateeditpage_click(object sender, eventargs e) {    lbltest.text += "**"; } 

do following please:

1- add updatepanel1.update(); following:

protected void btnupdateeditpage_click(object sender, eventargs e) {    lbltest.text += "**";    updatepanel1.update();    //your updatepanel should updatemode="conditional" have now.. } 

2- put button inside update panel

3- remove trigger not fire post back, code has like:

 <asp:scriptmanager id="scriptmanager1" runat="server"></asp:scriptmanager>    <asp:updatepanel id="updatepanel1" runat="server" updatemode="conditional">        <contenttemplate>          <asp:label id="lbltest" runat="server" text="label"></asp:label>          <asp:button id="btnupdateeditpage" cssclass="btnupdateeditpage" runat="server"                   text="button" onclick="btnupdateeditpage_click" />       </contenttemplate>    </asp:updatepanel>