using System;

public class Program

{

    public static void Main()

    {

        DateTime dt;

        var x = "2012.11.2";        if(!DateTime.TryParse(x,new System.Globalization.CultureInfo("tr-TR"), System.Globalization.DateTimeStyles.None, out dt)) {

            if(!DateTime.TryParseExact(x, "yyyyMMdd", null,System.Globalization.DateTimeStyles.None, out dt))

            {

                Console.WriteLine(dt.ToString("d"));

            }       

        }

        if(dt != DateTime.MinValue) {

            Console.WriteLine("Keyİn içine yazılacak");

        }

        Console.WriteLine("Son değer + " + dt.ToString());

    }

}