using System;
using System.Globalization;

public class Test
{
	public static void Main()
	{
		CultureInfo formato = null;
        formato = (CultureInfo)CultureInfo.InvariantCulture.Clone();
        formato.NumberFormat.NumberDecimalSeparator = ".";
        formato.NumberFormat.NumberGroupSeparator = ","; 

        string x = "19.30";
        System.Console.Write(Convert.ToDouble(x, formato));
	}
}