C#

FORM1
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void ex_Click(object sender, EventArgs e)
        {
            Form2 secondForm = new Form2();
            secondForm.Show();
        }
    }
}




FORM2
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form2 : Form
    {
        int[] nums = new int[17];
        public Form2()
        {
            InitializeComponent();
        }

            private void Form2_Load(object sender, EventArgs e)
            {
            int p;
            int contador = 1;
            Random rnd = new Random();
            for (int i = 1; i <= 16; i++)
            {
                string name = "" + contador;
                TextBox text = new TextBox
                {
                    Name = name,
                 };
                p = rnd.Next(1, 999);
                nums[i] = p;
                text.Text = "" + p;
                if (i <= 4) text.Location = new System.Drawing.Point(i * 50, 50);
                else if (i > 4 && i <= 8) text.Location = new System.Drawing.Point((i - 4) * 50, 100);
                else if (i > 8 && i <= 12) text.Location = new System.Drawing.Point((i - 8) * 50, 150);
                else text.Location = new System.Drawing.Point((i - 12) * 50, 200);
                Controls.Add(text);
                contador++;

            }


        }

        private void button17_Click(object sender, EventArgs e)
        {
            int x;
            int soma = 0;
            int ini;
            int tot = 0;
            for (int i = 0; i <= 16; i++)
            {
                ini = nums[i];
                while (nums[i] != 0)
                {
                    x = nums[i] % 10;
                    soma = soma + (x * x * x);
                    nums[i] = nums[i] / 10;
                }

                if (soma == ini)
                {
                    MessageBox.Show(ini.ToString());
                    tot++;
                }
                soma = 0;
            }
            }


    }
}