using System;

public class Program

{

    public static void Main()

    {

        string[] array = { "A", "B", "C", "D", "E", "F", "G" };

        var firstView = new Span<string>(array, 1, 4);

        var secondView = new Span<string>(array, 3, 3);

​

        firstView[0] = "X";

        secondView[0] = "Z";

        firstView[3] = "W";

        secondView[1] = "Y";

        firstView[5] = "Q"; // ****

        foreach (string x in array) Console.Write(x + " ");

    }

}