By default, the UltraGrid’s column summary will include text within the summary row which indicates the formula type used for calculating the value. This text can be omitted explicitly by modifying the DisplayFormat of the summary within the InitializeLayout event handler of the UltraGrid.

You will need to supply a substitution string that will be used to format the summary as demonstrated in the following sample code.

void ultraGrid1_InitializeLayout(object sender, Infragistics.Win.UltraWinGrid.InitializeLayoutEventArgs e)
        {
            //Explicitly display only the summary’s value, without the preceding text
            e.Layout.Bands[0].Summaries[0].DisplayFormat = "{0}";
            //Note: by default the DisplayFormat string in this scenario would be "Sum = {0}"
        }

Sincerely,
Chris K
Developer Support Engineer
Infragistics, Inc.
www.infragistics.com/support