MD5 Hash

md5hashFormat.cs

using (var md5 = System.Security.Cryptography.MD5.Create())
{
    using (var stream = File.OpenRead(@"E:\somefile.zip"))
    {
		Console.WriteLine(BitConverter.ToString(md5.ComputeHash(stream)).Replace("-","‌​").ToLower());
    }
}

md5hashFromStream.cs

foreach(var file in new DirectoryInfo(new Uri("file://somepath/").LocalPath).GetFiles().Select(x => x.FullName))
{
	Console.WriteLine(file);
	using (var stream = File.OpenRead(file))
	{
		using (var md5 = System.Security.Cryptography.MD5.Create())
		{
			var computedHash = md5.ComputeHash(stream);
			Console.WriteLine(BitConverter.ToString(computedHash).Replace("-", "‌​").ToLower());
		}
	}	
}