[]
Gets or sets the text orientation of the tick-mark labels.
The returned value represents the rotation angle of the tick-mark label text, in degrees.
int Orientation { get; set; }
Property Orientation As Integer
worksheet.Range["A1:B3"].Value = new object[,] {
{"Month", "Sales"},
{"Jan", 100},
{"Feb", 200}
};
IShape shape = worksheet.Shapes.AddChart(ChartType.ColumnClustered, worksheet.Range["A1:B3"]);
IAxis axis = shape.Chart.Axes.Item(AxisType.Category);
int orientation = axis.TickLabels.Orientation;