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string dirPath = @"Pfad mit 1000. Dateien";

                List<string> dirs = new List<string>(Directory.EnumerateDirectories(dirPath, "*", SearchOption.AllDirectories));

                foreach (var dir in dirs)
                {
                    listview1.Items.Add(dir.Substring(dir.LastIndexOf("\\") + 1));
                    count++;
                }
                listview1.Items.Add("FERTIG  " + " Count: " + count);