Export to Excel in C#: The Ultimate 2026 Tools Comparison Guide
Every C# application eventually needs to export data to Excel. The question is never whether you will need it, only what format your source data is in. CSV files from a CRM export, JSON from a REST API, XML from a legacy SOAP service, DataTables from a database query, or raw collections from your application logic. Each source format has different parsing requirements, edge cases, and library support. The following code sample shows a quick example snippet of how this works with the IronXL Excel library:
using IronXL;// DataTable to formatted Excel — the most common conversionSystem.Data.DataTable salesData = GetSalesData(); // your data sourceWorkBook workbook = WorkBook.Create();WorkSheet sheet = workbook.DefaultWorkSheet;// Populate from DataTablefor (int col = 0; col < salesData.Columns.Count; col++) sheet[0, col].Value = salesData.Columns[col].ColumnName;for (int row = 0; row < salesData.Rows.Count; row++) for (int col = 0; col < salesData.Columns.Count; col++) sheet[row + 1, col].Value = salesData.Rows[row][col]?.ToString() ??...
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