private void cSVImportierenToolStripMenuItem_Click(object sender, EventArgs e)
        {
            // Datei öffnen
            OpenFileDialog ofd = new OpenFileDialog();
            if (ofd.ShowDialog() != DialogResult.OK) return;

            IList<Judoka> jlst = Judoka.List();

            CsvMapper<Judoka> jcsv = new CsvMapper<Judoka>(ofd.FileName);
            jcsv.IgnoreErrors = true;
            List<Judoka> jclst = jcsv.List();

            foreach (Judoka perJ in jlst)
            {
                String perJHash = perJ.GetNameHash(Judoka.HashType.None);

                foreach (Judoka csvJ in jclst)
                {
                    if (perJHash == csvJ.GetNameHash(Judoka.HashType.None))
                    {
                        Console.WriteLine("Persistiert: " + perJ.ToString() + " [" + perJ.Id + "]");
                        csvJ.Id = perJ.Id;
                    }
                }
            }

            foreach (Judoka csvJ in jclst)
            {
                if (csvJ.Id == 0)
                {
                    Console.WriteLine("Nicht Persistent: " + csvJ.ToString());

                    if (csvJ.Geschlecht == null || csvJ.Verein == null || csvJ.Gürtel == null)
                    {
                        MessageBox.Show("Judoka hat Geschlecht, Verein oder Gürtel NULL");
                        continue;
                    }
                    else
                    {
                        csvJ.Save();
                    }
                }
            }
        }