How to Compare Text Files in C#. For more information, please follow link: https://kb.groupdocs.com/comparison/net/how-to-compare-text-files-in-csharp/

How to Compare Text Files in C#.cs

using System;
using GroupDocs.Comparison;

namespace CompareTextFilesInCSharp
{
    class Program
    {
        public static void Main(string[] args) // Main function to compare Text files using C#
        {            
            // Remove the watermark in output Text document by adding license
            string licensePath = "GroupDocs.Comparison.lic";
            GroupDocs.Comparison.License lic = new GroupDocs.Comparison.License();
            lic.SetLicense(licensePath);

            using (Comparer comparer = new Comparer("source.txt"))
            {
                comparer.Add("target.txt");
                comparer.Compare("result.txt");
            }       
            Console.WriteLine("Done");
        }
    }
}