using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(">>>Console Exemple:\n");     

        var vArray = new []{2,4};

        var columnHeader1 = "Index    Value\n";

        var multilineTextBox1_Text = 

            columnHeader1 +

            string.Join("\n", vArray.Select((x,i)=> $"{i+1,5}    {x,5}"));

​

​

        var boxSum_Text = vArray.Sum(); 

        var boxAvg_Text = vArray.Average();

​

​

        var columnHeader2 = "Index    Value    Histogram\n";

        var multilineTextBox2_Text = 

            columnHeader2 + 

            string.Join("\n", vArray.Select((x,i)=> $"{i+1,5}    {x,5}    {new String('*', x)}"));

        Console.WriteLine($"multilineTextBox1.Text :\n{multilineTextBox1_Text}"+"\n\n"

                         + $"boxSum.Text : {boxSum_Text}         "

                         + $"boxAvg.Text : {boxAvg_Text}"+"\n\n"

                         + $"multilineTextBox2.Text :\n{multilineTextBox2_Text}"

                         ); 

    }

}