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

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Ajax

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

Will asked on 03 Aug 2009, 01:50 PM

We are getting this error when the following code is added to a User Control:

    
            <telerik:RadAjaxManagerProxy ID="RadAjaxManagerProxy1" runat="server">  
        
                <AjaxSettings> 
        
                    <telerik:AjaxSetting AjaxControlID="JawbCategoryComboBox">  
        
                        <UpdatedControls> 
        
                            <telerik:AjaxUpdatedControl ControlID="JawbOccupationComboBox" /> 
        
                        </UpdatedControls> 
        
                    </telerik:AjaxSetting> 
        
                </AjaxSettings> 
        
            </telerik:RadAjaxManagerProxy>

It is the <telerik:AjaxUpdatedControl> line that is causing the issue. If I comment it out, the error goes away. I read the other posts about code within the <head> tags, but the only code in the <head> section is stylesheet code. There aren't any <% %> tags anywhere in the <head> section of the master page or any of the children. Here is the exact error:

[HttpException (0x80004005): The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).]
 System.Web.UI.ControlCollection.AddAt(Int32 index, Control child) +8669270
 Telerik.Web.UI.RadAjaxControl.MoveUpdatePanel(Control initiator, Control updated) +132

[HttpException (0x80004005): Please, see whether wrapping the code block, generating the exception, within RadCodeBlock resolves the error.]
 Telerik.Web.UI.RadAjaxControl.MoveUpdatePanel(Control initiator, Control updated) +180
 Telerik.Web.UI.RadAjaxControl.PerformRender() +375
 Telerik.Web.UI.RadAjaxControl.OnPageRender(HtmlTextWriter writer, Control page) +1222
 Telerik.Web.UI.RadAjaxControl.RenderPageInAjaxMode(HtmlTextWriter writer, Control page) +95
 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +256
 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19
 System.Web.UI.Page.Render(HtmlTextWriter writer) +29
 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1266

What else causes this error?

Thanks,
Bill

25 Answers, 1 is accepted

answered on 04 Aug 2009, 08:45 AM

I figured out how to work around the issue, but it makes absolutely no sense at all. It appears that any <% ... %> contents (including data bind controls, but not comments) will cause this issue unless it is the child of another control, with the exception of some non-repeater templated controls (i.e. UpdatePanels). For example, if the parent server control is an UpdatePanel, moving it inside of a Label will fix the problem. This is definitely a bug in the Telerik AjaxManager as this is not a limitation of ASP.NET AJAX.

The really bad thing about it is that there is absolutely no useful information in the error message to let you know what to look for. I spent the last 3 days trying to find a single control that was causing the the issue. This needs to be fixed.

answered on 05 Sep 2009, 09:56 PM

Hi Daniel,

Not sure if this issue was sorted out, but I'm having the same behavior.

The portion of the RadAjaxManager that causes the problem is here:

    
            <telerik:AjaxSetting AjaxControlID="QuickAddButton"> 
        
                <UpdatedControls> 
        
                    <telerik:AjaxUpdatedControl ControlID="FarmsRadGrid" LoadingPanelID="FarmGridLoading" /> 
        
                    <telerik:AjaxUpdatedControl ControlID="FarmsObjectDataSource" /> 
        
                    <telerik:AjaxUpdatedControl ControlID="PageLoadErrorPopup" /> 
        
                    <telerik:AjaxUpdatedControl ControlID="FarmNameRadTextBox" /> 
        
                </UpdatedControls> 
        
            </telerik:AjaxSetting>

The last AjaxUpdatedControl is a simple RadTextBox, but when I added it I got the same error as mentioned by Bill. Looking at his posts I went and added a around the RadTextBox in question and this solved the problem.

    
            <span runat="server"> 
        
                    <telerik:RadTextBox ID="FarmNameRadTextBox" runat="server" SelectionOnFocus="SelectAll" 
        
                        Width="181px" EmptyMessage="[farm name...]" InvalidStyleDuration="100" LabelCssClass="radLabelCss_Vista"> 
        
                    </telerik:RadTextBox> 
        
            </span>

Why would this be happening? Before adding the server span element it wouldn't work, if I remove it the error comes back. It's just this control that causes the problem. I have quite a few other controls referenced in the AjaxManager and none of them caused this problem.

Regards,
Jacques

answered on 06 Sep 2009, 07:59 AM

Hey Jacques,

It is an issue with RadAjaxManager, and it still exists. I looked into the problem further, and the problem is with the way that they are wrapping the control dynamically with an UpdatePanel. If the ControlID attribute of an AjaxUpdatedControl element references anything other than an UpdatePanel, that control is dynamically wrapped with an UpdatePanel, which is what is causing the problem. Simply wrapping the <% ... %> code within any server control allows you to work around the problem, which is what you observed. I'm hoping that it will be fixed soon, as the error messages often point you to the wrong section of code.

Take it easy,
Bill

answered on 22 Sep 2009, 05:07 PM

Hi,
Is there still no real fix for this?

I have a drag-and-drop example working fine on a test-page that uses my master page, but as soon as I try to use the code (and the RadAjaxManager) on a "real" page in my site, it blows up with the cited error. I've tried the workarounds noted in this forum, to no avail. I'm suspecting my ASP.NET Localization, where I have tags like LoadingText="<%$ Resources:resources, LoadingFromSvrLbl %>" ALL OVER THE PLACE. I cannot possibly put all of the localization code inside RadCodeBlocks. The error messages do not point to anything intelligible. It is like looking for a needle in an hay stack. A real pain... and a disappointment.

Any tips?

Thanks!
R

answered on 11 May 2010, 03:11 PM

Hi, same problem here!..

I have a master/content page, same error... here is the code of my content page:

Does the SqlDataSource cause the problem??

    
            <asp:Content ID="Content1" ContentPlaceHolderID="CPH1" Runat="Server"> 
        
                <script type="text/javascript"> 
        
                    function GetRadWindow() { 
        
                        var oWindow = null; 
        
                        if (window.radWindow) oWindow = window.radWindow; //Will work in Moz in all cases, including clasic dialog 
        
                        else if (window.frameElement.radWindow) oWindow = window.frameElement.radWindow; //IE (and Moz as well) 
        
                        return oWindow; 
        
                    } 
        
                 function Close() { 
        
                    GetRadWindow().close(); 
        
                } 
        
                //Se llama a la función que recarga el grid y se cierra la ventana secundaria 
        
                function CloseAndRebind() { 
        
                    GetRadWindow().BrowserWindow.refreshGrid(); 
        
                    GetRadWindow().close(); 
        
                } 
        
            </script> 
        
             <asp:SqlDataSource ID="DataSourceSistema" runat="server" ConnectionString="<%$ ConnectionStrings:SqlConnectionString %>"  
        
                SelectCommand="SELECT * FROM [sistema_computacional] ORDER BY [nombre]" OldValuesParameterFormatString="original_{0}"> 
        
               </asp:SqlDataSource> 
        
                <telerik:RadAjaxManagerProxy ID="RadAjaxManagerProxy1" runat="server"> 
        
                    <AjaxSettings> 
        
                        <telerik:AjaxSetting AjaxControlID="Panel1"> 
        
                            <UpdatedControls> 
        
                                <telerik:AjaxUpdatedControl ControlID="Panel1"  
        
                                    LoadingPanelID="RadAjaxLoadingPanel1" /> 
        
                            </UpdatedControls> 
        
                        </telerik:AjaxSetting> 
        
                    </AjaxSettings> 
        
                </telerik:RadAjaxManagerProxy> 
        
                <telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" Runat="server"  
        
                    Skin="Default"> 
        
                </telerik:RadAjaxLoadingPanel> 
        
                <asp:Panel ID="Panel1" runat="server"> 
        
            <table style="width: 100%" cellpadding="0" cellspacing="0"> 
        
                    <tr> 
        
                        <td style="text-align: left; width: 147px;" class="etiqueta"> 
        
                            Nombre:</td> 
        
                        <td> 
        
                            <telerik:RadTextBox ID="txtBoxNombre" Runat="server"  
        
                                EmptyMessage="No hay un nombre asignado al componente" Width="425px"> 
        
                            </telerik:RadTextBox> 
        
                            &nbsp;<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"  
        
                                ControlToValidate="txtBoxNombre" ErrorMessage="Campo requerido"></asp:RequiredFieldValidator> 
        
                        </td> 
        
                    </tr> 
        
                    <tr> 
        
                        <td style="text-align: left; width: 147px;" class="etiqueta"> 
        
                            Descripción:</td> 
        
                        <td> 
        
                            <telerik:RadTextBox ID="txBoxDescripcion" Runat="server"  
        
                                EmptyMessage="Indique una descripción para el componente" Rows="5"  
        
                                TextMode="MultiLine" Width="425px"> 
        
                            </telerik:RadTextBox> 
        
                            &nbsp;<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"  
        
                                ControlToValidate="txBoxDescripcion" ErrorMessage="Campo requerido"></asp:RequiredFieldValidator> 
        
                        </td> 
        
                    </tr> 
        
                    <tr> 
        
                        <td style="text-align: left; width: 147px;" class="etiqueta"> 
        
                            Sistema:</td> 
        
                        <td> 
        
                            <telerik:RadComboBox ID="rboxSistema" Runat="server"  
        
                                DataSourceID="DataSourceSistema" DataTextField="nombre"  
        
                                DataValueField="clave_sistema" Filter="Contains" AutoPostBack="True"  
        
                                ValidationGroup="none" Width="300px"> 
        
                            </telerik:RadComboBox> 
        
                            &nbsp;<asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server"  
        
                                ControlToValidate="rboxSistema" ErrorMessage="Campo requerido"></asp:RequiredFieldValidator> 
        
                        </td> 
        
                    </tr> 
        
                    <tr> 
        
                        <td style="text-align: left; width: 147px;" class="etiqueta"> 
        
                            Tipo de Componente:</td> 
        
                        <td> 
        
                            <telerik:RadComboBox ID="rboxTipoComponente" Runat="server"  
        
                                EmptyMessage="No existen tipos de componentes para este sistema"  
        
                                Filter="Contains" ValidationGroup="none" Width="350px"> 
        
                            </telerik:RadComboBox> 
        
                            &nbsp;<asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server"  
        
                                ControlToValidate="rboxTipoComponente" ErrorMessage="Campo requerido"></asp:RequiredFieldValidator> 
        
                        </td> 
        
                    </tr> 
        
                    <tr> 
        
                        <td style="text-align: left; width: 147px;" class="etiqueta"> 
        
                            Componente Activo:</td> 
        
                        <td> 
        
                            <asp:CheckBox ID="ckbActivo" runat="server" /> 
        
                        </td> 
        
                    </tr> 
        
                    <tr> 
        
                        <td style="text-align: left; font-weight: 700; " colspan="2"> 
        
                            <table style="width: 100%" cellpadding="1" cellspacing="0"> 
        
                                <tr> 
        
                                    <td style="text-align: left; width: 147px;" class="etiqueta"> 
        
                            Archivos Asociados:</td> 
        
                                    <td> 
        
                                        <telerik:RadTextBox ID="txtBoxNewArchivo" Runat="server" Width="225px"  
        
                                            ValidationGroup="archivos"> 
        
                                        </telerik:RadTextBox> 
        
            &nbsp;<asp:Button ID="btnAgregar" runat="server" Text="Agregar" CssClass="BotonAzul"  
        
                                            ValidationGroup="archivos" /> 
        
                                        &nbsp;<asp:RequiredFieldValidator ID="RequiredFieldValidator5" runat="server"  
        
                                            ControlToValidate="txtBoxNewArchivo" ErrorMessage="Se requiere un nombre"  
        
                                            ValidationGroup="archivos"></asp:RequiredFieldValidator> 
        
                                    </td> 
        
                                </tr> 
        
                                <tr> 
        
                                    <td colspan="2" style="text-align: left"> 
        
                                        <table cellpadding="0" cellspacing="0" style="width: 100%"> 
        
                                            <tr> 
        
                                                <td style="text-align: left; width: 147px;"> 
        
                                                    &nbsp;</td> 
        
                                                <td style="font-size: small; text-align: center" width="3%"> 
        
                                                    <b>Activo</b></td> 
        
                                                <td> 
        
                                                    &nbsp;</td> 
        
                                            </tr> 
        
                                            <tr> 
        
                                                <td> 
        
                                                    &nbsp;</td> 
        
                                                <td colspan="2"> 
        
                                        <telerik:RadListBox ID="radListArchivos" runat="server" AllowDelete="True"  
        
                                            CheckBoxes="True" style="text-align: left" Height="125px"  Width="400px"> 
        
            <ButtonSettings TransferButtons="All"  AreaWidth="90px" RenderButtonText="True"  VerticalAlign="Middle"></ButtonSettings> 
        
                                        </telerik:RadListBox> 
        
                                                </td> 
        
                                            </tr> 
        
                                        </table> 
        
                                    </td> 
        
                                </tr> 
        
                            </table> 
        
                        </td> 
        
                    </tr> 
        
                    <tr> 
        
                        <td style="text-align: right; font-weight: 700; width: 147px; height: 30px;"> 
        
                            </td> 
        
                        <td style="text-align: right; height: 30px;"> 
        
                            <asp:Label ID="lblError" runat="server" style="color: #CC0000" ></asp:Label> 
        
                            <asp:Button ID="btnGuardar" runat="server" Text="Guardar"  
        
                                CssClass="BotonAzul" /> 
        
                            <input id="Button1" class="BotonAzul" type="button" value="Cancelar" onclick="javascript: Close(); return false;" /></td> 
        
                    </tr> 
        
                    </table> 
        
                        </asp:Panel> 
        
                  <% =strJavascript%> 
        
            </asp:Content>

answered on 27 Oct 2010, 02:22 PM

Hi Lubna,

I am afraid the issue has not been fixed, because the causes of its occurrence remain the same.

When you add a code block to a web page, the page parser will use a SetRenderMethodDelegate, which in turn will make the controls collection of the code block's parent read-only.

On the other hand, in order to add update panels on the fly, RadAjax inserts a dummy control before and after the control to be ajaxified. This is needed because the ajaxified control cannot be reparented (which will occur if an update panel is inserted in the page just like that). If this dummy control injection happens in a read-only control collection, you will receive the observed error.

The solution for the problem is to use code blocks inside a telerik:RadCodeBlock control, as explained in the previous posts.

Regards,
Dimo
the Telerik team

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answered on 04 Sep 2013, 04:07 PM

hi all,

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

As Will and Hoventer.J says
This error can be solved by put enclose 
for example <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
 <AjaxSettings>
 <telerik:AjaxSetting AjaxControlID="RadComboBox_Owner_Name">
 <UpdatedControls>
 <telerik:AjaxUpdatedControl ControlID="RadComboBox_Owner_Name" />
 </UpdatedControls>
 </telerik:AjaxSetting>
</telerik:RadAjaxManager >

we have to

<telerik:RadComboBox ID="RadComboBox_Owner_Name" runat="server" AllowCustomText="false" ShowMoreResultsBox="true" >
 </telerik:RadComboBox> 
I tried on master page,radscriptblock,codeblock method nothings happen,atlast span works....

Thanks for writing......

answered on 09 Sep 2013, 04:15 PM

Try the next order

1.-telerik:RadAjaxManager
2.-telerik:RadScriptManager
3.-telerik:RadAjaxLoadingPanel

its all

<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">

<AjaxSettings>

<telerik:AjaxSetting AjaxControlID="RadGrid1" >

<UpdatedControls>

<telerik:AjaxUpdatedControl ControlID="RadGrid1" LoadingPanelID="RadAjaxLoadingPanel1"/>

</UpdatedControls>

</telerik:AjaxSetting>

</AjaxSettings>

</telerik:RadAjaxManager>

<br />

<telerik:RadScriptManager ID="RadScriptManager1" runat="server"></telerik:RadScriptManager>

<telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" Skin="Telerik"></telerik:RadAjaxLoadingPanel>

answered on 10 Sep 2013, 12:43 PM

Hello,

@Manuel Buendia

1.-telerik:RadScriptManager/asp:ScriptManager
2.-telerik:RadAjaxManager
3.-telerik:RadAjaxLoadingPanel

As per .net Framework if we used any ajax control, then we have add scriptmanager before use of any ajaxcontrol.

@Siraj

If you used "<%= %> or <%# %>" in your page then put this code in to RadcodeBlock.

1. Please put your JavaScript code in to RadCodeBlock
2. Ex: if you assign any property in to span/div/label/tr in aspx page then put this code into RadCodeBlock.

<telerik:RadCodeBlock ID="RadCodeBlock1" runat="server">

<%= YourPropertyName %>

</telerik:RadCodeBlock>

Thanks,
Jayesh Goyani

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

25 Answers, 1 is accepted

RadCodeBlock and RadScriptBlock

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