Spreadsheetgear Example -

// 6. Add totals row worksheet.Cells["A5"].Value = "TOTALS"; worksheet.Cells["B5"].Formula = "=SUM(B2:B3)"; worksheet.Cells["D5"].Formula = "=SUM(D2:D3)";

// 4. Add sample data (normally from DB) worksheet.Cells["A2"].Value = "Widget A"; worksheet.Cells["B2"].Value = 150; worksheet.Cells["C2"].Value = 12.99; spreadsheetgear example

// 8. Auto-fit columns for readability worksheet.Cells["A:D"].Columns.AutoFit(); Auto-fit columns for readability worksheet

// 1. Create a new workbook and get the active worksheet IWorkbook workbook = Factory.GetWorkbook(); IWorksheet worksheet = workbook.Worksheets["Sheet1"]; worksheet.Name = "Sales Report"; Runs in any

var generator = new ReportGenerator(); generator.CreateSalesReport(); Console.WriteLine("Excel report generated successfully."); What Makes This Powerful? | Challenge | SpreadsheetGear Solution | |-----------|--------------------------| | Server deployment | No COM, no Excel install. Runs in any .NET app (ASP.NET, Windows Service, Azure Function). | | Performance | In-memory, thread-safe, and up to 100x faster than Interop. | | Formulas & functions | Supports 400+ built-in Excel functions, including array formulas. | | Rendering | Can convert worksheets to PDF, PNG, or HTML without Excel. | | Compatibility | Reads/writes .xls, .xlsx, .xlsm, .csv — preserves charts, pivot tables, and macros. | Real-World Use Case Extension Suppose you need to email this report as a PDF. With SpreadsheetGear, you can add two lines:

// 3. Apply formatting to headers (bold, background color) IRange headerRange = worksheet.Cells["A1:D1"]; headerRange.Font.Bold = true; headerRange.Interior.Color = System.Drawing.Color.LightGray; headerRange.Borders.LineStyle = SpreadsheetGear.Advanced.Cells.LineStyle.Continuous;