[]
Gets or sets whether the chart displays #N/A values as empty cells.
If this property is true, data points whose values evaluate to #N/A
are displayed as blank cells in the chart.
bool DisplayNaAsBlank { get; set; }
Property DisplayNaAsBlank As Boolean
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered, 20, 20, 300, 200).Chart;
chart.DisplayNaAsBlank = true;
bool displayNaAsBlank = chart.DisplayNaAsBlank;