C# CompareVersions via http://stackoverflow.com/questions/30494/compare-version-identifiers

CompareVersions.cs

/// <summary>
/// Compare versions of form "1,2,3,4" or "1.2.3.4". Throws FormatException
/// in case of invalid version.
/// </summary>
/// <param name="strA">the first version</param>
/// <param name="strB">the second version</param>
/// <returns>less than zero if strA is less than strB, equal to zero if
/// strA equals strB, and greater than zero if strA is greater than strB</returns>
public static int CompareVersions(string strA, string strB)
{
    var vA = new System.Version(strA.Replace(",", "."));
    var vB = new System.Version(strB.Replace(",", "."));

    return vA.CompareTo(vB);
}

test.cs

static void Main(string[] args)
    {
        Test("1.0.0.0", "1.0.0.1", -1);
        Test("1.0.0.1", "1.0.0.0", 1);
        Test("1.0.0.0", "1.0.0.0", 0);
        Test("1, 0.0.0", "1.0.0.0", 0);
        Test("9, 5, 1, 44", "3.4.5.6", 1);
        Test("1, 5, 1, 44", "3.4.5.6", -1);
        Test("6,5,4,3", "6.5.4.3", 0);

        try
        {
            CompareVersions("2, 3, 4 - 4", "1,2,3,4");
            Console.WriteLine("Exception should have been thrown");
        }
        catch (FormatException e)
        {
            Console.WriteLine("Got exception as expected.");
        }

        Console.ReadLine();
    }

    private static void Test(string lhs, string rhs, int expected)
    {
        int result = CompareVersions(lhs, rhs);
        Console.WriteLine("Test(\"" + lhs + "\", \"" + rhs + "\", " + expected +
            (result.Equals(expected) ? " succeeded." : " failed."));
    }