string[] fileNames, FileInfos;
string path = text.Text;
DirectoryInfo direcInfo = new DirectoryInfo(path);
FileInfo[] files = direcInfo.GetFiles("*.mp3");
foreach (FileInfo fileInfo in files)
{
// Buradaki fileInfo.Name ile fileInfo.FullName sorun çıkartıyor.
fileNames = fileInfo.Name;
FileInfos = fileInfo.FullName;
listbox2.Items.Add(fileNames);
}