Sets or returns the rotation angle of text in a chart region. If the ChartRegion object represents the chart area, the angle returned will be the default rotation angle for all text items outside of the plot area. If the ChartRegion object represents the plot area, the angle returned will be the default rotation angle for all text items within the plot area.

 public int TextRotationAngle{ get; set; }

Public Property TextRotationAngle() As Integer