using System;

using System.Globalization;

using System.Threading;

​

public class Program

{   

    public static void Main()

    {       

        // Outputs: .

        Console.WriteLine(CultureInfo.InvariantCulture.NumberFormat.NumberDecimalSeparator);

        // Outputs: .

        Console.WriteLine(new CultureInfo("en-US").NumberFormat.NumberDecimalSeparator);

        // Outputs: ,

        Console.WriteLine(new CultureInfo("nl-NL").NumberFormat.NumberDecimalSeparator);

        // Outputs: <depends on what is set as the current culture>

        Console.WriteLine(CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator);

    }

}