<asp:Repeater ID="Repeater1" runat="server" DataSourceID="SqlDataSource1">
        <ItemTemplate>

            <asp:HyperLink ID="HyperLink1" NavigateUrl='<%# "~/Demo.aspx/" + Eval("CategoryName") %>'  runat="server"><%# Eval("CategoryName") %></asp:HyperLink>

    </ItemTemplate>
    </asp:Repeater>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server"
        ConnectionString="<%$ ConnectionStrings:ApplicationServices %>"
        SelectCommand="SELECT [ID], [CategoryName] FROM [Categories]">
    </asp:SqlDataSource>