using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        var value = "€5,432,109.876";

        var cultureInfo = CultureInfo.CreateSpecificCulture("fr-FR");

​

        decimal result;

​

        if (!decimal.TryParse(value, NumberStyles.Any, cultureInfo, out result))

        {

            Console.WriteLine(string.Format("Unable to parse '{0}' as a number using the '{1}' culture with currency symbol '{2}'.", value, cultureInfo.IetfLanguageTag, cultureInfo.NumberFormat.CurrencySymbol));

            return;

        }

​

        Console.WriteLine(result.ToString(cultureInfo));

    }   

}