The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).
The Controls collection cannot be modified because the control contains code blocks (i.e. <% … %>).
Error Page
Basically this error occurs when a code block is placed in the MasterPage like this
<%@ Master Language=”C#” AutoEventWireup=”True” Inherits=”TrainingWeb” CodeBehind=”TrainingWeb.master.cs” %>
<%@ Register Src=”UserControls/TopMenu.ascx” TagName=”TopMenu” TagPrefix=”uc1″ %>
<!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 id=”Head1″ runat=”server”>
<meta http-equiv=”Content-Type” content=”text/html; charset=iso-8859-1″ />
<title></title>
<link href=”styles.css” rel=”stylesheet” type=”text/css” />
<script language=”JavaScript” src=’<%= ResolveClientUrl(“~/mm_menu.js”)%>‘></script>
</head>
<body>
<form id=”form1″ runat=”server”>
<asp:ContentPlaceHolder ID=”ContentPlaceHolder1″ runat=”server”>
</asp:ContentPlaceHolder>
</form>
</body>
</html>
As you can see from the above code with the highlited colour if you mention the code block like this you can get the above error.
SOLUTION:
In order to avoid this error just copy the codeblock from the head tag to the content place holder in the master page like this
<%@ Master Language=”C#” AutoEventWireup=”True” Inherits=”TrainingWeb” CodeBehind=”TrainingWeb.master.cs” %>
<%@ Register Src=”UserControls/TopMenu.ascx” TagName=”TopMenu” TagPrefix=”uc1″ %>
<!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 id=”Head1″ runat=”server”>
<meta http-equiv=”Content-Type” content=”text/html; charset=iso-8859-1″ />
<title></title>
<link href=”styles.css” rel=”stylesheet” type=”text/css” />
</head>
<body>
<form id=”form1″ runat=”server”>
<asp:ContentPlaceHolder ID=”ContentPlaceHolder1″ runat=”server”>
<script language=”JavaScript” src=’<%= ResolveClientUrl(“~/mm_menu.js”)%>‘></script>
</asp:ContentPlaceHolder>
</form>
</body>
</html>
This solves the problem.
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