using System.Globalization;
public static void Main()
Console.WriteLine("Hello World");
string s = "20.09.2015 10.16.12";
bool isValid = DateTime.TryParseExact(s, "dd.MM.yyyy HH.mm.ss", CultureInfo.InvariantCulture, DateTimeStyles.None, out d);
Console.WriteLine(isValid.ToString());
Console.WriteLine(d.ToString());