How do calculate MD5 values of all files in a system using C#?

using System.IO;
using System.Security.Cryptography;

public static class Algorithms
{
    public static readonly HashAlgorithm MD5 = new MD5CryptoServiceProvider();
}

public static string GetChecksum(string filePath, HashAlgorithm algorithm)
{
    using (var stream = new BufferedStream(File.OpenRead(filePath), 100000))
    {
        byte[] hash = algorithm.ComputeHash(stream);
        return BitConverter.ToString(hash).Replace("-", String.Empty);
    }
}

string path = @"C:\Folder\file.txt";

string checksumMd5 = GetChecksum(path, Algorithms.MD5);