1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30:
31:
32:
33:
34:
35:
36:
37:
38:
39:
40:
41:
42:
43:
44:
45:
46:
47:
48:
49:
50:
51:
52:
53:
54:
55:
56:
57:
58:

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.Diagnostics;
using System.Windows.Forms;

namespace WindowsFormsApp2
{
    public partial class Form1 : Form
    {
        int Width = System.Windows.Forms.Screen.PrimaryScreen.Bounds.Width;
        int Height = System.Windows.Forms.Screen.PrimaryScreen.Bounds.Height;
        bool locked = true;
        public Form1()
        {
            InitializeComponent();
        }

        void Form1_Load(object sender, EventArgs e)
        {
            //-------------------------------------------------------------------
            this.Size = new System.Drawing.Size(Width, Height);
            this.Left = 0;
            this.Top = 0;
            //-------------------------------------------------------------------
            this.textBox1.Size = new System.Drawing.Size(Width / 3, (Height / 5) / 2);
            this.textBox1.Top = (programm.Height / 2) - ((Height / 5) / 2);
            this.textBox1.Left = (programm.Width / 2) - ((Width / 3) / 2);
            //-------------------------------------------------------------------
            this.button1.Size = new System.Drawing.Size(textBox1.Width / 3, (textBox1.Height / 5) * 2);
            this.button1.Top = textBox1.Top + textBox1.Height + 20;
            this.button1.Left = (textBox1.Left + (textBox1.Width / 2)) - button1.Width / 2;
            //-------------------------------------------------------------------
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (locked)
            {
                e.Cancel = false;
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "test")
            {
                locked = false;
                this.Close();
            }
        }
    }
}