ASP.NET runtime error: Only Content controls are allowed directly in a content page that contains Content controls.

I am trying to use a style sheet (perhaps errantly) in an asp page using a ref link... compiliing in VS2005.  The style sheet reference: <link href="stylesheet1.css" type="text/css" rel="stylesheet" />
Can I reference a stylesheet?  If so how?
Page Code:
<%@ Page Language="C#" MasterPageFile="~/ToolBarMasterPage.master" AutoEventWireup="true" CodeBehind="Page4.aspx.cs" Inherits="CommonToolbar1.Page4" Title="Untitled Page 4"%>

<link href="stylesheet1.css" type="text/css" rel="stylesheet" />

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server"
<script runat="server">

    protected void menuTabs_MenuItemClick(object sender, MenuEventArgs e)
    {
        multiTabs.ActiveViewIndex = Int32.Parse(menuTabs.SelectedValue);
    }
</script>

 <table style="height:400px;width:100%"  cellpadding="0" cellspacing="0" ><tr style="height:100px"><td align="center" style="height:20px; background-color: gainsboro;">
     <span style="font-size: 14pt; font-family: Verdana">Content Area Page 4
     my blog
    <asp:Menu
        id="menuTabs"
        CssClass="menuTabs"
        StaticMenuItemStyle-CssClass="tab"
        StaticSelectedStyle-CssClass="selectedTab"
        Orientation="Horizontal"
        OnMenuItemClick="menuTabs_MenuItemClick"
        Runat="server">
        <Items>
        <asp:MenuItem
            Text="Tab 1"
            Value="0"
            Selected="true" />
        <asp:MenuItem
            Text="Tab 2"
            Value="1"/>
        <asp:MenuItem
            Text="Tab 3"
            Value="2" />
        <asp:MenuItem
            Text="Tab 4"
            Value="3" />
           
        </Items>
    </asp:Menu>      
    <asp:MultiView
        id="multiTabs"
        ActiveViewIndex="0"
        Runat="server">
        <asp:View ID="view1" runat="server">
        Contents of first tab      
        </asp:View>
        <asp:View ID="view2" runat="server">      
         <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
             DataSourceID="SqlDataSource2">
         </asp:GridView>
            <asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:SuntreckoConnectionString2 %>"
                SelectCommand="SELECT [Coach_ID], [Coach_Name], [Coach_Org_ID], [Coach_Gen_ID], [Coach_Notes] FROM [Coach]"></asp:SqlDataSource>
       
        </asp:View>
        <asp:View ID="view3" runat="server">  
        Contents of third tab  
        </asp:View>
                <asp:View ID="view4" runat="server">
        Contents of fourth tab
        </asp:View>
    </asp:MultiView>    
     </span>
 </td></tr> <tr style="height:380px">
 <td align="center" style="height:500px; background-color: gainsboro;">
  <asp:Label ID="lblInfo" runat="server" BackColor="#FFFFC0" Font-Bold="True" Font-Italic="True" Font-Names="Arial Narrow" Font-Size="Medium" ForeColor="Blue" Width="225px"></asp:Label>
</td></tr></table>
</asp:Content>
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