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Controls collection Cannot be modified

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Hi i am Akhtar Abbas i am using telerik controls in my ASP.NET web application. I am currently designig a login page i am using RadStyleSheetManager, RadAjaxManager, RadAjaxLoadingPanel and RadCodeBlock. the HTML for the page is below

 

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Login.aspx.cs" Inherits="AccessCenter.Login" %>

<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <meta charset="utf-8">

    <title>Log In</title>
    <link href='http://fonts.googleapis.com/css?family=Open+Sans:400,700' rel='stylesheet' type='text/css'>
      <link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/font-awesome/4.3.0/css/font-awesome.min.css">
</head>
<body>
    <div class="wrapper">
        <div class="back1">

            <p class="title">Evac</p>
            <form runat="server" id="form1" class="login">
                <asp:ScriptManager runat="server" ID="smLogin"></asp:ScriptManager>
                
                <telerik:RadStyleSheetManager runat="server">
                    <StyleSheets>                        
                        <telerik:StyleSheetReference Path="css/normalize.css" />
                        <telerik:StyleSheetReference Path="css/login.css" />
                    </StyleSheets>
                </telerik:RadStyleSheetManager>


                <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
                    <AjaxSettings>
                        <telerik:AjaxSetting AjaxControlID="btnLogin">
                            <UpdatedControls>
                                <telerik:AjaxUpdatedControl ControlID="form1" LoadingPanelID="RadAjaxLoadingPanel1"></telerik:AjaxUpdatedControl>
                                <telerik:AjaxUpdatedControl ControlID="txtUserName"></telerik:AjaxUpdatedControl>
                                <telerik:AjaxUpdatedControl ControlID="txtPassword"></telerik:AjaxUpdatedControl>
                            </UpdatedControls>
                        </telerik:AjaxSetting>
                    </AjaxSettings>
                </telerik:RadAjaxManager>

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

                <asp:TextBox runat="server" ID="txtUserName" placeholder="Username" autofocus></asp:TextBox>

                <asp:TextBox runat="server" ID="txtPassword" placeholder="Password"></asp:TextBox>

                <asp:TextBox runat="server" ID="txtCaptcha" CssClass="captcha-fld"></asp:TextBox>

                <asp:TextBox runat="server" ID="txtCaptchaText" CssClass="captcha-fld-type"></asp:TextBox>

                <button>
                    <i class="spinner"></i>
                    <asp:Button runat="server" ID="btnLogin" CssClass="login-submit" OnClick="btnLogin_Click" />
                </button>
                <asp:Label ID="lblError" runat="server" ForeColor="Red" Visible="false"></asp:Label>
                <a href="#">Forgot your password?</a>
                <a class="right2" href="#">Sign Up</a>
                
                <telerik:RadCodeBlock ID="RadCodeBlock1" runat="server">
                    <script src="js/index.js" type="text/javascript"></script>
                </telerik:RadCodeBlock>
            </form>
        </div>
        <footer></footer>
    </div>
    <script src='http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js'></script>
</body>
</html>

I also have added settings in web.config.

 

<appSettings>
    <add key="ValidationSettings:UnobtrusiveValidationMode" value="None"/>
    <add key="Telerik.Web.UI.StyleSheetFolders" value="~/css" />
  </appSettings>

<system.web>

    <httpHandlers>
      <add path="Telerik.Web.UI.WebResource.axd" verb="*" type="Telerik.Web.UI.WebResource, Telerik.Web.UI" validate="false" />
    </httpHandlers>
    
  </system.web>

<system.webServer>
    <validation validateIntegratedModeConfiguration="false"/>
    <modules>
      <remove name="ApplicationInsightsWebTracking"/>
      <add name="ApplicationInsightsWebTracking" type="Microsoft.ApplicationInsights.Web.ApplicationInsightsHttpModule, Microsoft.AI.Web" preCondition="managedHandler"/>
    </modules>
    <handlers>
      <add name="Telerik_Web_UI_DialogHandler_aspx" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler"/>
      <add name="Telerik_Web_UI_SpellCheckHandler_axd" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler"/>
      <add name="Telerik_Web_UI_WebResource_axd" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource"/>
    </handlers>
  </system.webServer>

 

when i load my page then i have got the following error on the page

 

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

 

How to resolve this?

Note: These controls are purchased controls

I neet urgent responce please reply me as fast as possible because i have deadline of the project

 

 


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