[Solved] RadAjaxManager issue

[Maxim]

I'm getting this error while using RadAjaxManager.
"The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>)."
To reproduce. Create a master file and then add a default page inheriting master file. See contents below.
Here is sample ASPX file

<%@ Page Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" Title="Untitled Page" %>

<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>
<%@ Register Assembly="RadInput.Net2" Namespace="Telerik.WebControls" TagPrefix="rad" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
    <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
        <AjaxSettings>
            <telerik:AjaxSetting AjaxControlID="RadTextBox1">
                <UpdatedControls>
                    <telerik:AjaxUpdatedControl ControlID="RadTextBox2" />
                </UpdatedControls>
            </telerik:AjaxSetting>
        </AjaxSettings>
    </telerik:RadAjaxManager>
    <rad:RadTextBox ID="RadTextBox1" runat="server">
    </rad:RadTextBox>
    <rad:RadTextBox ID="RadTextBox2" runat="server">
    </rad:RadTextBox>
    <script type="text/javascript">
        var cID = "<%=RadTextBox1.ClientID %>";
    </script>
</asp:Content>

[Konstantin Petkov]

Hi Maxim,

Indeed, the error will appear when you add server-side code blocks inside the markup. You can wrap the script within RadCodeBlock as suggested in Prometheus docs here.

Should you need further assistance, please get back to us.

Greetings,
Konstantin Petkov
the Telerik team

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[Maxim]

I should have read documentation more carefully.
Thank you for your help.