Convert datetime dd/mm/yyyy to mm/dd/yyyy using c#

 string dt=  DateTime.ParseExact("28/08/2012", "dd/MM/yyyy", CultureInfo.InvariantCulture).ToString("MM/dd/yyyy", CultureInfo.InvariantCulture);

//Converting DateTime
Convert.ToDateTime(lbldt.Text, CultureInfo.CreateSpecificCulture("en-AU").DateTimeFormat);