C# use TryParseExact to convert string to date

  static void Test1()
        {
            List<string> list1 = new List<string>();
            list1.Add("2009/08/03");
            list1.Add("2009/8/4");
            list1.Add("2009-08-05");
            list1.Add("20090806");

            string[] expectedFormats = { "yyyy/MM/dd", "yyyy/M/d", "yyyy-MM-dd", "yyyyMMdd" };
            CultureInfo ci = new CultureInfo("en-US");
            DateTime dt;

            Console.WriteLine("curr culture = " + CultureInfo.CurrentCulture.ToString());
            Console.WriteLine("us culture = " + ci.ToString());

            foreach (string val in list1)
            {
                if (DateTime.TryParseExact(val, expectedFormats, ci,
                    System.Globalization.DateTimeStyles.None, out dt))
                {
                    Console.WriteLine("converted {0} to date value {1}", val, dt.ToString("yyyy-MM-dd"));
                }
                else
                {
                    Console.WriteLine("can not parse " + val);
                }
            }
        }