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The Controls collection cannot be modified because the control contains code blocks(i.e.<% …%>) (ASP.NET HTML Editor Extender)

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After adding an HTML Editor extender to my asp.net page, an error shows when rendering the page to the browser as stated which is the title of this post. I found the solution in asp.net forums which is to wrap aspx markup codes enclosed with <% %> using placeholder control. The code below is in my ASP.NET Master Page:
<head runat="server">  
   <title></title>  
   <link href="~/Styles/Site.css" rel="stylesheet" type="text/css" />  
   <asp:PlaceHolder Runat="server">  
     <script src='<%=Page.ResolveUrl("~/Scripts/jquery-1.4.1.min.js") %>' language="javascript" type="text/javascript"></script>  
   </asp:PlaceHolder>  
   <asp:ContentPlaceHolder ID="HeadContent" runat="server">  
   </asp:ContentPlaceHolder>  
 </head>
Reference: Handling Ajax Extenders Error
:)

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