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The Controls collection cannot be modified because the control contains code blocks Error..

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Ajax

This is a migrated thread and some comments may be shown as answers.

Marcel Rossi asked on 12 Mar 2010, 09:12 PM

Hi

I had the following Server Error after including a RadAjaxManager to a Webpage:

The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).

In many forums they said to be sure to remove all code blocks (<% %>) in the Head-Section of the Page.
Or delete the runat="server" from the Head-Section.

Noting helped in my case. But the ting with the code blocks helped me find it out.
It had nothing to do with the Head-Section of the Page or the Master-Page.

I simply had to remove the code blocks IN my page.

That's the page-code that produces the Error:

    
            <%@ Page Language="vb" AutoEventWireup="false" CodeBehind="Default.aspx.vb" Inherits="CollectionModifyProblem._Default" %> 
        
            <%@ Register assembly="Telerik.Web.UI" namespace="Telerik.Web.UI" tagprefix="telerik" %> 
        
            <!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>Untitled Page</title> 
        
            </head> 
        
            <body> 
        
            <form id="form1" runat="server">  
        
            <telerik:RadScriptManager ID="RadScriptManager1" runat="server">  
        
            </telerik:RadScriptManager> 
        
            <div> 
        
            <%="Select a Brand (norally I use a var here):"%> 
        
            <telerik:RadListBox ID="lstbBrands" runat="server"></telerik:RadListBox> 
        
            <%="Select a Type: (norally I use a var here)"%> 
        
            <telerik:RadListBox ID="lstbCarTypes" runat="server"></telerik:RadListBox> 
        
            </div> 
        
            <telerik:RadAjaxManager runat="server">  
        
            <AjaxSettings> 
        
            <telerik:AjaxSetting AjaxControlID="lstbBrands">  
        
            <UpdatedControls> 
        
            <telerik:AjaxUpdatedControl ControlID="lstbCarTypes" /> 
        
            </UpdatedControls> 
        
            </telerik:AjaxSetting> 
        
            </AjaxSettings> 
        
            </telerik:RadAjaxManager> 
        
            </form> 
        
            </body> 
        
            </html>

After a while I replaced the two code-blocks with labels:

    
            <%="Select a Brand (norally I use a var here):"%> 
        
            to  
        
            <asp:Label runat="server" ID="lblTitle_Brands">Select a Brand (noraly I fill this by code):</asp:Label>

and

    
            <%="Select a Type (norally I use a var here):"%> 
        
            to  
        
            <asp:Label runat="server" ID="lblTitle_Type">Select a Type (noraly I fill this by code):</asp:Label>

That's all you have to do!

Maybe this will help also others!

Freundliche Grüsse
Marcel

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The Controls collection cannot be modified because the control contains code blocks Error..

1 Answer, 1 is accepted