System.Globalization.DateTimeFormatInfo.GetDayName C# (CSharp) Méthode

        public extern string GetDayName(DayOfWeek dayofweek);

        public static String DateTimeAFechaCortaConDiaMesTexto(DateTime fecha)
        {
            System.Globalization.DateTimeFormatInfo mfi = Thread.CurrentThread.CurrentUICulture.DateTimeFormat;
            string DiaSemana = mfi.GetDayName(fecha.DayOfWeek);
            string Mes       = mfi.GetAbbreviatedMonthName(fecha.Month).Replace(".", "");

            String fechaSt = DiaSemana.Substring(0, 3) + "," + IntANDigitos(fecha.Day, 2) + @"" + Mes + @"'" + fecha.Year.ToString().Substring(2, 2);

            return(fechaSt);
        }