// Initialize Excel application excelApp = new Excel.Application(); excelApp.Visible = false; // Run in background excelApp.DisplayAlerts = false;

| Alternative | Pros | Cons | |-------------|------|------| | (by Microsoft) | No Excel installation required, fast, reliable | Cannot execute macros or formulas, no real-time rendering | | EPPlus (commercial for non-open use) | High performance, formula support | License cost for commercial use (v5+) | | ClosedXML | Open source, simpler API than Open XML | Limited to basic features, slower for huge files | | NPOI | Free, supports .xls and .xlsx | Less documentation, occasional bugs | | Excel Data Reader | Fast read-only access | No write support |

1. Overview Microsoft.Office.Interop.Excel is a primary interop assembly (PIA) provided by Microsoft to allow .NET applications (C#, VB.NET, F#) to communicate with Microsoft Excel through COM (Component Object Model). Version 15.0.0.0 corresponds to Microsoft Office 2013 .

finally

Excel.Application excelApp = null; Excel.Workbook workbook = null; Excel.Worksheet worksheet = null;

using Excel = Microsoft.Office.Interop.Excel; public void CreateExcelReport()

catch (Exception ex)

// Save file string savePath = @"C:\Reports\SalesReport.xlsx"; workbook.SaveAs(savePath, Excel.XlFileFormat.xlOpenXMLWorkbook);