Datakeyname - updatecommand

How can I update my data using DataKeyNames="RefID" when using <UpdateParameters>

 <asp:GridView ID="GridView3" runat="server" AllowPaging="True"
                    AllowSorting="True" AlternatingRowStyle-Wrap="True" AutoGenerateColumns="False"
                    AutoGenerateEditButton="True" DataKeyNames="RefID"
                    DataSourceID="SqlDataSource2" Font-Size="Small" FooterStyle-Font-Size="Medium"
                    PageSize="10" Width="698px">

etc..

<asp:BoundField DataField="RefID" HeaderText="RefID"
                            SortExpression="RefID" Visible="false" />



  <asp:SqlDataSource ID="SqlDataSource2" runat="server"
                ConnectionString="<%$ ConnectionStrings:dbdoneConnectionString %>"        
                              SelectCommand= "my sp1" SelectCommandType="StoredProcedure"
                              UpdateCommand="my sp2" UpdateCommandType="StoredProcedure">   < parameter is where datakeyname = Refid


etc...

<UpdateParameters>  < I am have storeprocedure for this
                <asp:Parameter Name="RefID" String="RefID" />  ?
                </UpdateParameters>