This should be simple enough question but I am having problems with it, I am trying to enable disable sidebar in umbraco template based on Model's property.

    <%@ Master Language="C#" MasterPageFile="~/masterpages/Master.master" AutoEventWireup="true" %>
    <asp:content ContentPlaceHolderId="MainContent" runat="server">
    <umbraco:Macro runat="server" language="cshtml">
    @{
        boolean enableSidebar = Model.GetProperty("enableSidebar").Value;
    }
    <div class="container" style="margin-top:20px;">
        <div class="row">
            <div class="@(enableSidebar ? "span9" : "span12")">
                <div class="default-content">
                    <!-- CONTENT -->
                    <asp:ContentPlaceHolder runat="server" ID="MainContent" />
                </div>
            </div>
            @if (enableSidebar) { 
                <div class="span3 box">
                    <div class="green-header-box"></div>
                    <div class="inline box-content"> 
                        <!-- SIDEBAR -->
                        <asp:ContentPlaceHolder runat="server" ID="SidebarContent" />
                    </div>
                </div>
            }
        </div>
    </div>
    </umbraco:Macro>
    </asp:content>

I am getting error that says I cannot use asp tags inside macro which is fine, but I do not know how to do I achieve same effect without using macro, can you please help me re-write this properly?