using System;

using System.Collections.Generic;

using System.Collections;

​

public class Program

{

    public static void Main()

    {

        var array = new int[, ]{{1, 2}, {3, 4}, {5, 6}, {7, 8}};

        Console.WriteLine(array[0, 1]);

    }

}

​

public static class Ext

{

    public static IEnumerable<T> SliceRow<T>(this T[, ] array, int row)

    {

        for (var i = array.GetLowerBound(1); i <= array.GetUpperBound(1); i++)

        {

            yield return array[row, i];

        }

    }

​

    public static IEnumerable<T> SliceColumn<T>(this T[, ] array, int column)

    {

        for (var i = array.GetLowerBound(0); i <= array.GetUpperBound(0); i++)

        {

            yield return array[i, column];

        }

    }

}