Unknown server tag cc1: ToolkitScriptManager

I am using ajaxcontrols and in that all controls are working well But I had not found any of the control named as ToolkitScriptManager so I had just copied this tag in .html page.

What shall I do? The version of framework in hosting server is 2.

My Web.config file is:

<pages>
  <controls>
    <add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
    <add tagPrefix="ajaxToolkit" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit"/>
  </controls>
</pages>

  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Extensions" publicKeyToken="31bf3856ad364e35" TagPrefix="cc1"/>
        <bindingRedirect oldVersion="3.5.0.0" newVersion="1.0.61025.0"/>
      </dependentAssembly>
    </assemblyBinding>
  </runtime>

Aspx page:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="CS.aspx.cs" Inherits="CS" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<!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></title>
    <style type="text/css">
        .Star
        {
            background-image: url(images/Star.gif);
            height: 17px;
            width: 17px;
        }
        .WaitingStar
        {
            background-image: url(images/WaitingStar.gif);
            height: 17px;
            width: 17px;
        }
        .FilledStar
        {
            background-image: url(images/FilledStar.gif);
            height: 17px;
            width: 17px;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <cc1:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
    </cc1:ToolkitScriptManager>
    <cc1:Rating ID="Rating1" AutoPostBack="true" OnChanged="OnRatingChanged" runat="server"
        StarCssClass="Star" WaitingStarCssClass="WaitingStar" EmptyStarCssClass="Star"
        FilledStarCssClass="FilledStar">
    </cc1:Rating>
    <br />
    <asp:Label ID="lblRatingStatus" runat="server" Text=""></asp:Label>
    </form>
</body>
</html>

Solution

Try using the ajaxToolkit prefix.

<ajaxToolkit:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
</ajaxToolkit:ToolkitScriptManager>

same for Rating control.