No nada sigue sin hacer nada mira mi codigo..
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
DataKeyNames="id_Sac" DataSourceID="SqlDataSource1"
EnableModelValidation="True" Width="100%" BackColor="White" BorderColor="#CCCCCC"
BorderStyle="None" BorderWidth="1px" CellPadding="3">
<Columns>
<asp:BoundField DataField="id_Sac" HeaderText="id_Sac" SortExpression="id_Sac"
InsertVisible="False" ReadOnly="True" />
<asp:BoundField DataField="st_Monto" HeaderText="st_Monto"
SortExpression="st_Monto" />
<asp:BoundField DataField="dt_FechaRegistro" HeaderText="dt_FechaRegistro"
SortExpression="dt_FechaRegistro" />
<asp:BoundField DataField="st_NombreCompleto" HeaderText="st_NombreCompleto"
SortExpression="st_NombreCompleto" />
<asp:CommandField ShowDeleteButton="True" />
</Columns>
<FooterStyle BackColor="White" ForeColor="#000066" />
<HeaderStyle BackColor="#006699" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="White" ForeColor="#000066" HorizontalAlign="Left" />
<RowStyle ForeColor="#000066" />
<SelectedRowStyle BackColor="#669999" Font-Bold="True" ForeColor="White" />
</asp:GridView>
*************************************
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:ConnectionStringMySql %>"
ProviderName="<%$ ConnectionStrings:ConnectionStringMySql.ProviderNa me %>"
SelectCommand="SELECT tbl_sac2.id_Sac, tbl_sac2.st_Monto, tbl_sac2.dt_FechaRegistro, cat_plazas_usuarios.st_NombreCompleto FROM tbl_sac2, cat_plazas_usuarios WHERE tbl_sac2.id_PlazaUsuario = cat_plazas_usuarios.id_PlazaUsuario"
DeleteCommand="DELETE FROM tbl_sac2 WHERE id_Sac = @id_Sac">
<DeleteParameters>
<asp:Parameter Name="id_Sac" />
</DeleteParameters>
</asp:SqlDataSource>
Que podrá ser...