Hello,

Could you please try the following code and see if it meets your requirements:

        void ultraGrid1_SummaryValueChanged(object sender, Infragistics.Win.UltraWinGrid.SummaryValueChangedEventArgs e)
        {
            if (int.Parse(e.SummaryValue.Value.ToString()) == 0)
            {
                e.SummaryValue.SummarySettings.DisplayFormat = " ";
            }
        }

 Please feel free to let me know if I misunderstood you or if you have any other questions.