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Gets the major gridlines for the axis.
Only axes in the primary axis group can have gridlines. You can use the returned IGridlines object to configure the appearance of major gridlines after enabling them with HasMajorGridlines.
IGridlines MajorGridlines { get; }
ReadOnly Property MajorGridlines As IGridlines
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered, 20, 20, 300, 200).Chart;
IAxis axis = chart.Axes.Item(AxisType.Value, AxisGroup.Primary);
axis.HasMajorGridlines = true;
IGridlines gridlines = axis.MajorGridlines;