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Debugging GridView / ObjectDataSource events
<asp:ObjectDataSource ID="Things" runat="server"
    TypeName="BLL.Thing"
    UpdateMethod="UpdateThing"
    OnUpdating="Things_Updating"
    OnUpdated="Things_Updated">
    <UpdateParameters>
        <asp:SessionParameter
            Name="userContext"
            SessionField="UserContext"
            Type="Object" />
        <asp:Parameter Name="thing" Type="Object" />
    </UpdateParameters>
</asp:ObjectDataSource>

<EditItemTemplate>
    <asp:ImageButton ID="ImageButton_Save" runat="server"
        CommandName="Update"
        SkinID="Save"
        CausesValidation="false"
        CommandArgument='<%# Eval("Id") %>' />
    <asp:ImageButton ID="ImageButton_Cancel" runat="server"
        CommandName="Cancel"
        SkinID="Cancel"
        CausesValidation="false" />
</EditItemTemplate>

protected void Things_Updating(object sender, ObjectDataSourceMethodEventArgs e)
{
    e.InputParameters["thing"] = _theThing;
}

protected void gridThings_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
    e.NewValues.Add("thing", _theThing);
}

protected void myGridView_RowUpdating(Object sender, GridViewUpdateEventArgs e)
{
    e.Cancel = true;
}

private void myObjectDataSource_Updating(object source, ObjectDataSourceMethodEventArgs e)
{
    e.Cancel = true;
}