<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
        <asp:UpdatePanel ID="UpdatePanel1" runat="server" ChildrenAsTriggers="false" UpdateMode="Conditional">
            <ContentTemplate>
                <asp:TextBox ID="txtCkEditor" TextMode="MultiLine" runat="server" Width="100%" Height="300px"></asp:TextBox>
                <script>
                    CKEDITOR.replace('<%=txtCkEditor.ClientID%>', {});
                </script>
                <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
            </ContentTemplate>
        </asp:UpdatePanel>
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protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                
            }
        }
        protected void Button1_Click(object sender, EventArgs e)
        {
            string Value = txtCkEditor.Text; // luôn trả về rỗng nếu đặt trong Update Panel
        }
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