using System;

using System.Globalization;

​

public class Program

{

    public static void Main()

    {

        DateTime x = new DateTime(2015,12,31);

        int i1 = getWeekOfYearIso8601(x);

        DateTime y = new DateTime(2016,1,1);

        int i2 = getWeekOfYearIso8601(y);

        Console.WriteLine(i1);

        Console.WriteLine(i2);

        Console.WriteLine(x.Year);

        Console.WriteLine(y.Year);

        string u = "";

        string[] ua = u.Trim().Split(new string[] { "," }, StringSplitOptions.RemoveEmptyEntries);

        if(ua!=null)

        {

        Console.WriteLine(ua);

        }

    }

​

}