using System;

using System.Data;

public class Program

{

    public static void Main()

    {

            DataTable table = new DataTable();

    table.Columns.Add("Weight", typeof(int));

    table.Columns.Add("Name", typeof(string));

    table.Columns.Add("Breed", typeof(string));

    table.Columns.Add("Date", typeof(DateTime));

​

    // Here we add five DataRows.

    table.Rows.Add(57, "Koko", null,

        DateTime.Now);

    table.Rows.Add(130, "Fido", "Bullmastiff",

        DateTime.Now);

    table.Rows.Add(92, "Alex", "Anatolian Shepherd Dog",

        DateTime.Now);

    table.Rows.Add(25, "Charles", "Cavalier King Charles Spaniel",

        DateTime.Now);

    table.Rows.Add(7, "Candy", "Yorkshire Terrier",

        DateTime.Now);

        Console.WriteLine("Hello World");

        Console.WriteLine(table.Rows[0]["Name"].ToString());

        Console.WriteLine(table.Rows[0]["Breed"].ToString());

        Console.WriteLine(table.Rows[0]["Breed"] == null);

        Console.WriteLine((table.Rows[0]["Breed"].ToString() == null).ToString());

    }

}