class SchleifenThread
  {
    public Thread Thread;
    #region Variablendeklaration
    public decimal UpperMaximum = 0;
    public string OutText, OutMD5;
    private char[] valueString;
    private int count = 0;
    private readonly char startChr = 'A', endChr = 'Z';
    #endregion
    public SchleifenThread()
    {
      this.valueString = new char[128];
      for (int i = 0; i < 128; i++)
        this.valueString[i] = this.startChr;
      this.valueString[0]--;
      this.Thread = new Thread(new ThreadStart(Execute));
    }
    void Execute()
    {
      string Output;
      ListViewItem ActualItem;
      MD5 md5 = new MD5CryptoServiceProvider();
      #region Schleife
      [...]
      #endregion
    }
  }