親フォルダ
01.using System;
02.using System.Drawing;
03.using System.Windows.Forms;
04. 
05.namespace BuildField
06.{
07.    public partial class Form1 : Form
08.    {
09.        private TextBox[] textBoxArray;
10. 
11.        public Form1()
12.        {
13.            InitializeComponent();
14.            controlInit();
15.        }
16. 
17.        private void controlInit()
18.        {
19. 
20.            int fieldCount = 25;
21. 
22.            textBoxArray = new TextBox[fieldCount];
23. 
24.            for (int i = 0; i < fieldCount; i++)
25.            {
26. 
27.                this.textBoxArray[i] = new TextBox();
28.                this.textBoxArray[i].Location = new Point(144, 29 + i * 35);
29.                this.textBoxArray[i].Name = $"textBox{i}";
30.                this.textBoxArray[i].Size = new Size(588, 19);
31.                this.textBoxArray[i].TabIndex = i;
32.                this.Controls.Add(this.textBoxArray[i]);
33. 
34.            }
35. 
36.            Console.WriteLine($"フィールドを{fieldCount}個作成しました");
37.        }
38. 
39.    }
40.}