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How to add 3D charts in SfSpreadSheet control?
To enable the Spreadsheet for rendering 3D charts when importing Excel sheet, register Graphic3DChartCellRenderer by using Add3DGraphicChartCellRenderer method of spreadsheet.
C#
//To render 3D charts in SfSpreadsheet control. this.spreadsheetControl.Add3DGraphicChartCellRenderer(new Graphic3DChartCellRenderer());

Download SpreadsheetDemo from GitHub