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public static string GuessEncoding(byte[] data)
{
	Encoding encoding;
	return GuessEncoding(data, out encoding);
}

public static string GuessEncoding(byte[] data, out Encoding encoding)
{
	foreach (var e in new Encoding[] { Encoding.UTF8, Encoding.Unicode, Encoding.BigEndianUnicode })
	{
		encoding = e;
		var pre = encoding.GetPreamble();
		if (Enumerable.SequenceEqual(data.Take(pre.Length), pre))
			return encoding.GetString(data, pre.Length, data.Length - pre.Length);
	}

	foreach (var e in new Encoding[] { new UTF8Encoding(false), Encoding.Default })
	{
		encoding = e;
		var str = encoding.GetString(data);
		if (Enumerable.SequenceEqual(encoding.GetBytes(str), data))
			return str;
	}

	throw new NotSupportedException();
}