C# - Bruteforce

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

        private void button1_Click(object sender, EventArgs e)
        {
            button1.Visible = false;
            button2.Visible = true;
            hauptteil();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            button2.Visible = false;
            button1.Visible = true;
        }

        private void alter_hauptteil()
        {
            char[] zeichen = new char[55];
            zeichen = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz.,_".ToCharArray();
            int counter = 0;
            //label1.Text = zeichen[counter].ToString();
            while (button2.Visible)
            {
                if (counter >= 55)
                {
                    counter = 0;
                }
                label1.Text = zeichen[counter].ToString();
                counter++;
                Application.DoEvents();
            }
        }

        private void hauptteil()
        {
            for (int stellen = 1; button2.Visible; stellen++)
            {
                char[] passwort = new char[stellen];
                int counter = 0;
                for (int tmp = 0; tmp < stellen; tmp++)
                {
                    passwort[tmp] = (char)33;
                }
                while (true)
                {
                erneut:
                    /*
                     * Platz für Anweisungen
                     */
                    MessageBox.Show(textBox1.Text);
                    if ((int)passwort[counter] < 126)
                    {
                        passwort[counter] = (char)(((int)passwort[counter]) + 1);
                    }
                    else
                    {
                        passwort[counter] = (char)33;
                        counter++;
                        try
                        {
                            passwort[counter] = (char)(((int)passwort[counter]) + 1);
                            if ((int)passwort[counter] > 125)
                            {
                                goto erneut;
                            }
                            counter = 0;
                        }
                        catch
                        {
                            break;
                        }
                    }
                    textBox1.Text = "";
                    for (int tmp = 0; tmp < stellen; tmp++)
                    {
                        textBox1.Text = textBox1.Text + passwort[tmp].ToString();
                    }
                    Application.DoEvents();
                    if (button1.Visible)
                    {
                        return;
                    }
                }
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            button2.Visible = false;
            button1.Visible = true;
        }
 




        
    }//****ENDE KLASSE****
}//****ENDE NAMESPACE****