using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        var serialized = (123.456).ToString(CultureInfo.InvariantCulture);

        Console.WriteLine(serialized);

        var myParsed = Double.Parse("123.456", CultureInfo.InvariantCulture);

        Console.WriteLine(myParsed);

        var swe = (123.456).ToString(new CultureInfo("sv-SE"));

        Console.WriteLine(swe);

        var sweParsed = Double.Parse("123.456", new CultureInfo("sv-SE"));

        Console.WriteLine(sweParsed);

    }

}