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MemoryStream serializedBinary = new MemoryStream(); spreadsheet.Workbook.SaveAsXml(serializedBinary, ExcelXmlSaveType.MSExcel);
For Printing in SfSpreadsheet, you can find the samples in the Dashboard in the following link
Link: Syncfusion Dashboard->WPF->Run Local Samples->Grids->Spreadsheet ->Miscellaneous->Printing.
Sample link: http://www.syncfusion.com/downloads/support/directtrac/general/ze/CS-1601887016