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Gets or sets the text direction of the chart title.
Use this property to determine how the chart title text is oriented, such as horizontal, vertical, or rotated layout.
TextDirection Direction { get; set; }
Property Direction As TextDirection
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered, 20, 20, 300, 200).Chart;
chart.ChartTitle.Text = "Sales Analysis";
chart.ChartTitle.Direction = TextDirection.Vertical;
TextDirection direction = chart.ChartTitle.Direction;