In daily data processing workflows, dealing with duplicate rows in Excel is one of the most common challenges for developers and data analysts. Whether you need data cleaning, automated report generation, or bulk data analysis, removing duplicate Excel rows is an indispensable routine task. This comprehensive guide will walk you through how to delete duplicate rows in Excel programmatically with C# using Free Spire.XLS for .NET, a free Excel library that requires no Microsoft Office installation. Environment Setup & NuGet Installation Before writing C# code to remove Excel duplicates, install the free Excel processing library via NuGet: Install-Package FreeSpire.XLS Enter fullscreen mode Exit fullscreen mode You can also search and install FreeSpire.XLS directly in Visual Studio’s Manage NuGet Packages panel. The free edition covers all essential features and fully supports duplicate row removal for small to medium Excel datasets. Step-by-Step C# Code to Remove Excel Duplicate Rows 1.…