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Gets or sets whether the axis has minor gridlines.
This property indicates whether minor gridlines are enabled for the axis. Only axes in the primary axis group can have gridlines.
bool HasMinorGridlines { get; set; }
Property HasMinorGridlines As Boolean
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered, 20, 20, 300, 200).Chart;
IAxis axis = chart.Axes.Item(AxisType.Value, AxisGroup.Primary);
axis.HasMinorGridlines = true;
bool hasMinorGridlines = axis.HasMinorGridlines;