anonymise a data file in csharp in csharp

using System;
using System.IO;

class AnonymizeData
{
    static void Main()
    {
        string inputFile = "data.csv";
        string outputFile = "anonymized_data.csv";

        using (var reader = new StreamReader(inputFile))
        {
            using (var writer = new StreamWriter(outputFile))
            {
                bool firstLine = true;
                while (!reader.EndOfStream)
                {
                    string line = reader.ReadLine();
                    if (firstLine)
                    {
                        // Write header line to output file unchanged.
                        writer.WriteLine(line);
                        firstLine = false;
                    }
                    else
                    {
                        // Anonymize data and write to output file.
                        string[] values = line.Split(',');
                        values[0] = Anonymize(values[0]);  // example: anonymize first column
                        writer.WriteLine(string.Join(',', values));
                    }
                }
            }
        }
    }

    static string Anonymize(string value)
    {
        // Replace PII with a random value.
        return Guid.NewGuid().ToString();
    }
}
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