<asp:FormView
                    runat="server"
                    ID="fvLogDetail"
                    DefaultMode="Insert"
                    DataSourceID="odsDetail"
                    OnDataBound="fvLogDetail_DataBound"
                    OnItemInserting="fvLogDetail_ItemInserting"
                    OnItemUpdating="fvLogDetail_ItemUpdating"
                    OnItemInserted="fvLogDetail_ItemInserted"
                    OnItemUpdated="fvLogDetail_ItemUpdated"
                    OnItemDeleted="fvLogDetail_ItemDeleted">

    protected void fvLogDetail_ItemUpdated(object sender, FormViewUpdatedEventArgs e)
    {
        if (e.Exception == null)
        {
            if (e.AffectedRows == 1)
            {
            }
           else
           {
                It always end up here even on successful updates

I must add that the formview is inside an update panel.