Define cultureinfo

            //Cria uma nova CultureInfo
            CultureInfo culture = (CultureInfo)CultureInfo.CurrentCulture.Clone();

            //Define os padrões para Números
            culture.NumberFormat.NumberDecimalSeparator = ",";
            culture.NumberFormat.NumberGroupSeparator = ".";

            //Define os padrões para Moeda
            culture.NumberFormat.CurrencyDecimalSeparator = ",";
            culture.NumberFormat.CurrencyGroupSeparator = ".";

            //Muda o CultureInfo da Thread Ativa
            Thread.CurrentThread.CurrentCulture = culture;
            Thread.CurrentThread.CurrentUICulture = culture;