using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        string stringAmount = "123,99.99";

        stringAmount = stringAmount.Replace(" ", "").Replace(",", ".");

        double doubleAmount;

        doubleAmount = double.Parse(stringAmount, NumberStyles.AllowCurrencySymbol | 

                                    NumberStyles.Number | NumberStyles.AllowThousands | 

                                    NumberStyles.AllowDecimalPoint);

        Console.WriteLine(doubleAmount);

        if (double.TryParse(stringAmount, out doubleAmount)) {

            Console.WriteLine(doubleAmount);

        } else {

            Console.WriteLine("Can't parse");

        }

    }

}