View difference between Paste ID: zyyvcSJt and f1fpzzcc

 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 Generator
 {
     public partial class Generator : Form
     {
         public Generator()
         {
             InitializeComponent();
         }
 
         private void button1_Click(object sender, EventArgs e)
         {
             timer1.Start();
             if ((progressBar1.Value == 100))
             {
              timer1.Stop();
              progressBar1.Value = 0;
              textBox1.Text = "";
              timer1.Start();
             }
 
         }
 
         private void timer1_Tick(object sender, EventArgs e)
         {
             progressBar1.Increment(1);
             if ((progressBar1.Value == 100))
             {
                 timer1.Stop();
                 Random random = new Random();
                 textBox1.Text = "" + (char)random.Next(65, 90) + (char)random.Next(65, 90) + (char)random.Next(65, 90) + random.Next(0, 9) + "-" + random.Next(0, 9) + (char)random.Next(65, 90) + (char)random.Next(65, 90) + random.Next(0, 9) + "-" + (char)random.Next(65, 90) + random.Next(0, 9) + (char)random.Next(65, 90) + random.Next(0, 9) + "-" + (char)random.Next(65, 90) + random.Next(0, 9) + (char)random.Next(65, 90) + random.Next(0, 9) + "-" + (char)random.Next(65, 90) + random.Next(0, 9) + (char)random.Next(65, 90) + random.Next(0, 9);
             }
         }
 
 private static string RandomString()
         {
             var chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ3454323LMNOPQRSTUVWXYZ001206789";
             var stringChars = new char[4];
             var random = new Random();
 
             for (int i = 0; i < stringChars.Length; i++)
             {
                 stringChars[i] = chars[random.Next(chars.Length)];
             }
 
             var finalString = new String(stringChars);
             return finalString;
         }
         private static string RandomString2()
         {
             var chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
             var random = new Random();
             var result = new string(
                 Enumerable.Repeat(chars, 4)
                           .Select(s => s[random.Next(s.Length)])
                           .ToArray());
             return result;
         }
         private static string RandomString3()
         {
             var chars = "ABWXYZ01234567IJKLMNOPQRSTUVWXYZ0123456789";
             var random = new Random();
             var result = new string(
                 Enumerable.Repeat(chars, 4)
                           .Select(s => s[random.Next(s.Length)])
                           .ToArray());
             return result;
         }
         private static string RandomString4()
         {
             var chars = "ABWXYZ01234567IJKLMNOPQRSTUVWBWXYZ0120123456789";
             var random = new Random();
             var result = new string(
                 Enumerable.Repeat(chars, 4)
                           .Select(s => s[random.Next(s.Length)])
                           .ToArray());
             return result;
         }
         private void textBox1_TextChanged(object sender, EventArgs e)
         {
             textBox1.TextAlign = HorizontalAlignment.Center;
         }
     }
 }