Export Data from Collections to Excel and Group It in C#

This sample demonstrates how to export data from .NET collections to an Excel workbook and group the data programmatically using C# and Syncfusion XlsIO. It is a practical example for generating structured, well-organized Excel reports without relying on Microsoft Excel.

What this sample shows

• Creates custom business objects stored in .NET collections
• Exports collection data to an Excel worksheet
• Groups rows based on specific fields
• Applies Excel outline levels for collapsible grouping
• Saves the Excel file efficiently using XlsIO

Prerequisites

• .NET Framework / .NET
• Syncfusion XlsIO NuGet package

Use cases

• Creating grouped Excel reports from in‑memory data
• Automating report generation for analytics and finance
• Structuring large datasets for better readability

This project serves as a concise reference for developers looking to transform collection-based data into grouped, professional Excel reports using C#.