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// For complete examples and data files, please go to https://github.com/groupdocsassembly/GroupDocs_Assembly_NET  
 //Setting up source open spreadsheet template
                    const String strSpreadsheetTemplate = "Spreadsheet Templates/Barcode.xlsx";
                    //Setting up destination open spreadsheet report 
                    const String strSpreadsheetReport = "Spreadsheet Reports/Barcode.xlsx";
                    try
                    {
                        //Instantiate DocumentAssembler class
                        DocumentAssembler assembler = new DocumentAssembler();
                        //Call AssembleDocument to generate  Report in open spreadsheet format
                        assembler.AssembleDocument(CommonUtilities.GetSourceDocument(strSpreadsheetTemplate), CommonUtilities.SetDestinationDocument(strSpreadsheetReport), DataLayer.GetCustomerData(), "customer");
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine(ex.Message);
                    }