Gembox.spreadsheet.dll Instant

var worksheet = reader.Worksheets[0]; foreach (var row in worksheet.Rows) // Process row by row without holding entire file in RAM Console.WriteLine(row.Cells[0].Value);

// Style a header var headerStyle = new CellStyle gembox.spreadsheet.dll

A unique feature of this DLL is direct HTML rendering: var worksheet = reader

// Add data worksheet.Cells[0, 0].Value = "Product"; worksheet.Cells[0, 1].Value = "Qty"; worksheet.Cells[0, 2].Value = "Price"; worksheet.Cells[0, 3].Value = "Total"; var worksheet = reader.Worksheets[0]

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

workbook.Save("Report.xlsx"); For truly massive files (500k+ rows), use the LoadOptions to stream data:

using (var reader = ExcelFile.LoadXlsx("hugefile.xlsx", new XlsxLoadOptions ReadDataOnly = true ))