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FileInfo oFile = new FileInfo(sDateien[iFileindex]);
int iMP3Count = 0;
MigrateUtils.CUtils.GetMP3Count(new DirectoryInfo(sEingabeordner), iMP3Count);

        public static int GetMP3Count(FileSystemInfo oFileSystemInfo, int iMP3Count)
        {
            var oDirInfo = oFileSystemInfo as DirectoryInfo;
            
            if (oDirInfo != null)
            {
                foreach (var oDirEntry in oDirInfo.GetFileSystemInfos())
                {
                    GetMP3Count(oDirEntry, iMP3Count);
                }
            }
            else
            {
                if (oFileSystemInfo.Name.EndsWith(".MP3", true, null))
                {
                    iMP3Count += 1;
                }
            }
            
            return iMP3Count;
        } // GetMP3Count