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Gets or sets the way that blank cells are plotted in the sparkline group.
Use this property to determine how blank values in the sparkline source data are displayed for the sparkline group.
DisplayBlanksAs DisplayBlanksAs { get; set; }
Property DisplayBlanksAs As DisplayBlanksAs
worksheet.Range["A1:C1"].Value = new object[] {1, null, 2};
ISparklineGroup group = worksheet.Range["D1"].SparklineGroups.Add(SparkType.Line, "A1:C1");
group.DisplayBlanksAs = DisplayBlanksAs.Zero;
DisplayBlanksAs blanksAs = group.DisplayBlanksAs;