Užsirašau, kad įvykus katastrofinei avarijai kompiuteriui, neprasmegtų mano kodai

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace Lisense_code
{
public partial class Form1 : Form
{
int TogMove;
int MValueX;
int MvalueY;
int resized = 0;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
textBox1.MaxLength = 4;
textBox2.MaxLength = 4;
textBox3.MaxLength = 4;
textBox4.MaxLength = 4;
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
if (textBox1.TextLength == 4)
{
textBox2.Focus();
}
}
private void textBox2_TextChanged(object sender, EventArgs e)
{
if (textBox2.TextLength == 4)
{
textBox3.Focus();
}
else if (textBox2.TextLength == 0)
{
textBox1.Focus();
}
}
private void textBox3_TextChanged(object sender, EventArgs e)
{
if (textBox3.TextLength == 4)
{
textBox4.Focus();
}
else if (textBox3.TextLength == 0)
{
textBox2.Focus();
}
}
private void pb_MouseDown_1(object sender, MouseEventArgs e)
{
TogMove = 1;
MValueX = e.X;
MvalueY = e.Y;
}
private void pb_MouseMove_1(object sender, MouseEventArgs e)
{
if (TogMove == 1)
{
this.SetDesktopLocation(MousePosition.X - MValueX, MousePosition.Y - MvalueY);
}
}
private void pb_MouseUp_1(object sender, MouseEventArgs e)
{
TogMove = 0;
}
private void textBox4_TextChanged(object sender, EventArgs e)
{
if (textBox4.TextLength == 0)
{
textBox3.Focus();
}
}
private void label7_Click(object sender, EventArgs e)
{
Application.Exit();
}
private void label8_Click(object sender, EventArgs e)
{
if (resized == 0)
{
this.Width = 800;
this.Height = 600;
resized = 1;
}
else
{
this.Width = 550;
this.Height = 190;
resized = 0;
}
}
}
}