Data binding order in ASP.NET

suppose following code:

<asp:FormView runat="server" ID="frmMain" DataSourceID="odsMain">
    <ItemTemplate>
        <asp:ObjectDataSource runat="server" ID="odsInner" />开发者_C百科
    </ItemTemplate>
</asp:FormView>
<asp:ObjectDataSource runat="server" ID="odsMain" />

Which ObjectDataSource would be executed? odsInner or odsMain? How can I change this order?

Thanks in Advance