[c#] Create Excel files from C# without office

Unless you have Excel installed on the Server/PC or use an external tool (which is possible without using Excel Interop, see Create Excel (.XLS and .XLSX) file from C#), it will fail. Using the interop requires Excel to be installed.

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How to properly set Column Width upon creating Excel file? (Column properties) Importing Excel into a DataTable Quickly How to fix 'Microsoft Excel cannot open or save any more documents' What reference do I need to use Microsoft.Office.Interop.Excel in .NET? How to read an excel file in C# without using Microsoft.Office.Interop.Excel libraries Reading Datetime value From Excel sheet How to make correct date format when writing data to Excel Create Excel files from C# without office Exporting the values in List to excel C# - How to add an Excel Worksheet programmatically - Office XP / 2003