c# - Update Panel not working properly causing full postback -


i have moved visual studio 4.5 , @ first update panels worked fine 1 day seemed stop altogether if start new project.

code behind:

public partial class testpage : system.web.ui.page {     protected void page_load(object sender, eventargs e)     {         if (ispostback)         {             label1.text = "post back";         }      }      protected void button1_click(object sender, eventargs e)     {         testl.text = datetime.now.tostring();         updatepanel1.update();     } }

page:

  <%@ page title="" language="c#" masterpagefile="~/site.master" autoeventwireup="true"        codebehind="testpage.aspx.cs" inherits="" %>  <asp:content id="content1" contentplaceholderid="headcontent" runat="server"> </asp:content> <asp:content id="content2" contentplaceholderid="maincontent" runat="server">      <asp:label id="label1" runat="server" ></asp:label>   <asp:button id="button1" runat="server" text="button" onclick="button1_click" />   <asp:updatepanel id="updatepanel1" updatemode="conditional" runat="server">     <contenttemplate>         <asp:label runat="server" id="testl"></asp:label>     </contenttemplate>     </asp:updatepanel> </asp:content>

even code causes post , cannot life of me figure out why. here references in case may missing 1 not realize. 

using system; using system.collections.generic; using system.linq; using system.web; using system.web.ui; using system.web.ui.webcontrols;

i have running in scriptmanager in masterpage.

  <%@ master language="c#" autoeventwireup="true" codebehind="site.master.cs" inherits="ufodatarepositorywebapplication.sitemaster" %>  <!doctype html> <html lang="en"> <head id="head1" runat="server"> <meta charset="utf-8" /> <title></title>  <asp:contentplaceholder runat="server" id="headcontent" /> </head> <body> <form runat="server" id="mainform">     <asp:scriptmanager id="scriptmanager1" runat="server"></asp:scriptmanager>     <header>         <div class="content-wrapper">              <div class="float-right">                  <div id="mainlogin_div">                     <div class="fb-login-button" data-show-faces="true" data-    width="400" data-max-rows="1"></div>                      <asp:updatepanel id="mainlogin_updatepanel"    updatemode="conditional" runat="server">                         <contenttemplate>                             <asp:panel id="unloggedmain_panel" runat="server"    visible="true">                                 <p>                                     <asp:linkbutton runat="server" postbackurl="login.aspx" cssclass="notloggedmenu"                                         id="mainlogin_link">login</asp:linkbutton>                                     <span style="color: #7e7f7f;">or </span>                                     <asp:linkbutton runat="server" postbackurl="register.aspx" cssclass="notloggedmenu"                                         id="mainregister_link">become    member</asp:linkbutton>                                 </p>                             </asp:panel>                             <asp:panel id="loggedmain_panel" clientidmode="static" runat="server" visible="false">                                 <span style="color: #cacccb;">welcome: </span>                                 <asp:linkbutton id="welcome_linkbutton" clientidmode="static" runat="server" postbackurl="~/userpanel.aspx"></asp:linkbutton>                                 <asp:linkbutton id="mainlogout_linkbutton" runat="server" onclick="mainlogout_user">  logout</asp:linkbutton>                             </asp:panel>                         </contenttemplate>                     </asp:updatepanel>                 </div>                  </ul>             </div>         </div>     </header>       <div id="body">         <asp:contentplaceholder runat="server" id="maincontent" />     </div>     </form>   </body> </html>

so should literally code have. intentionally took out inherits @ top of page post.


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