File Comparison Program in C#

using System;
using System.IO;

class FileComparison
{
    // Main method where the program starts execution
    static void Main(string[] args)
    {
        // Check if two file paths have been provided as arguments
        if (args.Length != 2)
        {
            Console.WriteLine("Usage: compareFiles  ");
            return;
        }

        // Get the file paths from the command line arguments
        string file1 = args[0];
        string file2 = args[1];

        // Check if both files exist
        if (!File.Exists(file1))
        {
            Console.WriteLine($"The file {file1} does not exist.");
            return;
        }

        if (!File.Exists(file2))
        {
            Console.WriteLine($"The file {file2} does not exist.");
            return;
        }

        // Open the files for reading
        using (FileStream fs1 = new FileStream(file1, FileMode.Open, FileAccess.Read),
                          fs2 = new FileStream(file2, FileMode.Open, FileAccess.Read))
        {
            // Check if the files have the same length
            if (fs1.Length != fs2.Length)
            {
                Console.WriteLine("The files are not identical (different sizes).");
                return;
            }

            // Compare the files byte by byte
            bool filesAreIdentical = true;
            int bytePosition = 0;
            while (fs1.Position < fs1.Length)
            {
                // Read a byte from both files
                int byte1 = fs1.ReadByte();
                int byte2 = fs2.ReadByte();

                // Check if the bytes are the same
                if (byte1 != byte2)
                {
                    filesAreIdentical = false;
                    Console.WriteLine($"Files differ at byte position {bytePosition}. File1 has byte {byte1}, File2 has byte {byte2}.");
                    break;
                }

                bytePosition++;
            }

            // Inform the user if the files are identical
            if (filesAreIdentical)
            {
                Console.WriteLine("The files are identical.");
            }
        }
    }
}

 Output

//Case 1 - Files are identical:

//For the command:
compareFiles file1.txt file2.txt

//Output:
The files are identical.

//Case 2 - Files are different:

//For the command:
compareFiles file1.txt file2.txt

//Output (if the files differ at byte position 100):
Files differ at byte position 100. File1 has byte 65, File2 has byte 66.