Validating a UCI: with or without linq

gistfile1.cs

//Using linq
private bool HasCorrectCheckDigit(string uci) {
	const string checkDigits = "ABCDEFGHKLMRTVWXY";
	try {

		int remainder = uci.Substring(0, 12)
			.Aggregate(Pair.Create(0, 0), (progress, character) => {
				int multiplier = 16 - progress.Second;
				int value = Convert.ToInt32(uci[progress.Second].ToString()) * multiplier;
				return Pair.Create(progress.First + value, progress.Second + 1);
			}, x => x.First % 17);

		return checkDigits[remainder] == uci[12];
	}
	catch {
		return false;
	}
}

//Using a good old for-loop
private bool HasCorrectCheckDigit(string uci) {
	const string checkDigits = "ABCDEFGHKLMRTVWXY";
	try {
		int total = 0;

		for (int i = 0; i < 12; i++) {
			int multiplier = 16 - i;
			int value = Convert.ToInt32(uci[i].ToString()) * multiplier;
			total += value;
		}

		int remainder = total % 17;

		return checkDigits[remainder] == uci[12];
	}
	catch {
		return false;
	}
}