public partial class WebForm1 : System.Web.UI.Page
    {
        protected String Test = "";
        protected void Page_Load(object sender, EventArgs e)
        {
            Test = "this is a test string";
        }
    }

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
    <%#Test %>
</asp:Content>

        <select id="Filial" name="Filial">
            <asp:Repeater ID="fllOptions" runat="server">
                <ItemTemplate>
                    <option value="<%#((DbDataRecord)Container.DataItem)[0]%>"><%#((DbDataRecord)Container.DataItem)[1]%></option>
                </ItemTemplate>
            </asp:Repeater>
        </select>