Double TryParse, NumberStyles.AllowDecimalPoint
using System; using System.Globalization; class MainClass{ public static void Main(){ string value; NumberStyles style; CultureInfo culture; double number; value = "123456,978"; style = NumberStyles.AllowDecimalPoint; culture = CultureInfo.CreateSpecificCulture("fr-FR"); if (Double.TryParse(value, style, culture, out number)) Console.WriteLine("Converted '{0}' to {1}.", value, number); else Console.WriteLine("Unable to convert '{0}'.", value); } }