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Gets or sets the thickness of the wall.
Use this property to read or change the current thickness setting of a wall in a 3-D chart, such as the back wall or side wall.
int Thickness { get; set; }
Property Thickness As Integer
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered3D, 20, 20, 360, 220).Chart;
chart.BackWall.Thickness = 5;
int thickness = chart.BackWall.Thickness;