Gembox.spreadsheet.dll

var workbook = new ExcelFile(); var worksheet = workbook.Worksheets.Add("Sales Report");

A unique feature of this DLL is direct HTML rendering: gembox.spreadsheet.dll

worksheet.Cells[1, 0].Value = "Widget"; worksheet.Cells[1, 1].Value = 10; worksheet.Cells[1, 2].Value = 5.99; worksheet.Cells[1, 3].SetFormula("=B2*C2"); var workbook = new ExcelFile(); var worksheet = workbook