Unknown server tag 'cc1:Editor. error
Am using asp.net Editor but am get Unknown server tag 'cc1:Editor.how to solve this.My Code :
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit.HTMLEditor" TagPrefix="cc1" %>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<cc1:Editor ID="Editor1" runat="server" Height="350px" />
</div>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
</form>
</body>
</html>