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Gets the IWall object that allows you to individually format the back wall of a 3-D chart.
Use the returned IWall to configure properties such as the back wall's fill, line, and thickness.
IWall BackWall { get; }
ReadOnly Property BackWall As IWall
worksheet.Range["A1:B3"].Value = new object[,] {
{"Quarter", "Sales"},
{"Q1", 100},
{"Q2", 200}
};
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered3D, 20, 20, 300, 200).Chart;
chart.SeriesCollection.Add(worksheet.Range["A1:B3"], RowCol.Columns, true, true);
IWall backWall = chart.BackWall;
backWall.Format.Fill.Color.RGB = Color.Red;