Getting a masterpage error in asp.net -


i trying add masterpage in asp.net getting error saying page contains markup not valid when attached masterpage. here masterpage file:

<%@ master language="c#" autoeventwireup="true" codefile="masterpage.master.cs"  inherits="pages_adminmaster" %>  <!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en"   "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">  <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> <asp:contentplaceholder id="head" runat="server"> </asp:contentplaceholder> </head> <body> <form id="form1" runat="server"> <div style="text-align: right">     <asp:contentplaceholder id="contentplaceholder1" runat="server">          <asp:linkbutton id="linkbutton1" runat="server" onclick="linkbutton1_click">log  out</asp:linkbutton>      </asp:contentplaceholder> </div> </form>

and here web form apply masterpage:

<%@ page language="c#" masterpagefile="~/pages/masterpage.master"  autoeventwireup="true" codefile="admin.aspx.cs" inherits="pages_admin" %>  <!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en"     "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">  <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> <style type="text/css">     .style1     {         text-decoration: underline;         color: #0000ff;     }     .style2     {         font-family: 15;         font-size: 12pt;         color: #0000ff;     } </style> </head> <body> <form id="form1" runat="server"> <div class="style2" style="text-align: right">  </div> </form> <p class="style1">     <a href="createcourse.aspx">create new course</a></p> <p class="style1">     <a href="modifycourse.aspx">modify course</a></p> <p class="style1">     <a href="createaccount.aspx">create new account</a></p> <p class="style1">     <a href="deleteaccount.aspx">delete account</a></p> <p class="style1">     <a href="disableaccount.aspx">disable account</a></p> <p class="style1">     <a href="dropstudent.aspx">drop student course</a></p> <p class="style1">     <a href="enrollstudent.aspx">enroll student course</a></p> <p class="style1">     <a href="getstudentinfo.aspx">get student info</a></p> <p class="style1">     <a href="getinstructorinfo.aspx">get instructor info</a></p> </body> </html>

and here error in browser:

server error in '/bannerweb' application.  content controls have top-level controls in content page or nested master  page references master page.  description: unhandled exception occurred during execution of current web  request. please review stack trace more information error ,     originated in code.   exception details: system.web.httpexception: content controls have top-level  controls in content page or nested master page references master page.  source error:   unhandled exception generated during execution of current web request.  information regarding origin , location of exception can identified using     exception stack trace below.  stack trace:    [httpexception (0x80004005): content controls have top-level controls in  content page or nested master page references master page.]    system.web.ui.masterpage.createmaster(templatecontrol owner, httpcontext context,  virtualpath masterpagefile, idictionary contenttemplatecollection) +8968123    system.web.ui.page.get_master() +54    system.web.ui.page.applymasterpage() +15    system.web.ui.page.performpreinit() +45    system.web.ui.page.processrequestmain(boolean includestagesbeforeasyncpoint, boolean     includestagesafterasyncpoint) +328

both pages in folder named pages. can me this? thanks.

the webform uses master page, need put content within <asp:content contentplaceholderid="contentplaceholder1" runat="server"></asp:content> maps content displayed @ page within master page.

msdn has more information on how use <asp:contentplaceholder /> on master pages , <asp:content /> @ http://msdn.microsoft.com/en-us/library/wtxbf3hh(v=vs.100).aspx.


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