DateTime dt = Calendar1.SelectedDate;
        string date = dt.ToShortDateString();
        DateTimeFormatInfo dateTimeFormatterProvider = DateTimeFormatInfo.CurrentInfo.Clone() as DateTimeFormatInfo;
        dateTimeFormatterProvider.ShortDatePattern = "MM/dd/yyyy";
        DateTime dateTime = DateTime.Parse(date, dateTimeFormatterProvider);
        string formatted = dateTime.ToString("dd/MM/yyyy");
        Response.Write(formatted);