using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string s = "5.1";

            double d;
            bool canParse;
            canParse = double.TryParse(s, out d);
            Console.WriteLine(canParse);
        }
    }
}