Duplicate files remover

using System.Security.Cryptography;


var files = Directory.GetFiles(@"G:\My Drive\");


var groupByLength = files.GroupBy(file => new FileInfo(file).Length)
    .Where(gp => gp.Count() > 1).ToList();

foreach (var fileByLength in groupByLength)
{
    var byLength = fileByLength.OrderBy(name => name.Length).ToList();
    string pivotFile = byLength.First();
    var pivot = Md5(pivotFile);
    foreach (var s in byLength.Skip(1))
    {
        if (pivot.SequenceEqual(Md5(s)))
        {
            Console.WriteLine($"{s} is duplicated {pivotFile}");
            File.Delete(s);
        }
    }
}

static byte[] Md5(string file)
{
    using var md5 = MD5.Create();
    using var stream = File.OpenRead(file);
    return md5.ComputeHash(stream);
}