Passing a selected row column value to the stored procedure

I have a simple Gridview control that has a delete command link on it.

If I use the delete SQL code in line it works fine. If I use a stored procedure to perform the SQL work, I can't determine how to pass the identity value to the SP. Snippets are below...

The grid
<asp:GridView ID="GridView2" runat="server" AllowPaging="True" AllowSorting="True"
AutoGenerateColumns="False" DataSourceID="SqlDataSource2">
<Columns>
<asp:BoundField DataField="member_id" HeaderText="member_id" InsertVisible="False"
ReadOnly="True" SortExpression="member_id" />
<asp:BoundField DataField="member_username" HeaderText="member_username" SortExpression="member_username" />
<asp:BoundField DataField="member_firstname" HeaderText="member_firstname" SortExpression="member_firstname" />
<asp:BoundField DataField="member_lastname" HeaderText="member_lastname" SortExpression="member_lastname" />
<asp:BoundField DataField="member_state" HeaderText="State" SortExpression="member_state" />
<asp:CommandField ShowEditButton="True" />
<asp:CommandField ShowDeleteButton="True" />
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:rentalConnectionString1 %>"
SelectCommand="renMemberSelect" SelectCommandType="StoredProcedure"
DeleteCommand="renMemberDelete" DeleteCommandType="StoredProcedure"
OldValuesParameterFormatString="original_{0}"
>

<DeleteParameters>

<asp:Parameter Name="member_id" Type="Int32" />

</DeleteParameters>

</asp:SqlDataSource
the SP

CREATE PROCEDURE renMemberDelete
@.member_id as int
As UPDATE [renMembers]
SET member_status=1
WHERE [member_id] = @.member_id
GO

Try:GridView2.DataKeyNames="member_id"

or

<asp:GridView ID="GridView2" runat="server" AllowPaging="True" AllowSorting="True"
AutoGenerateColumns="False" DataSourceID="SqlDataSource2" DataKeyNames="member_id">