Microsoft.office.interop.excel Version 15.0.0.0 Apr 2026

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

Excel.Application excelApp = null; Excel.Workbook workbook = null; Excel.Worksheet worksheet = null; microsoft.office.interop.excel version 15.0.0.0

| 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 | // Save file string savePath = @"C:\Reports\SalesReport

// Auto-fit columns Excel.Range usedRange = worksheet.UsedRange; usedRange.EntireColumn.AutoFit(); Excel.Application excelApp = null

// Clean up workbook.Close(false); excelApp.Quit();

This assembly acts as a managed wrapper around Excel’s unmanaged COM interfaces, enabling developers to create, read, modify, and automate Excel workbooks programmatically without directly dealing with COM pointers, VARIANT types, or memory management complexities.