Ok, so what I did to achieve this task was quite easy. I made a list of my folder content, then I displayed it in a listbox
public static List<string> getFiles()
{
List<string> listReturn = new List<string>();
string[] filePaths = Directory.GetFiles(backupFolder);
return filePaths.ToList();
}
Here, you can find info about GetFiles method. You can specify if you want your displayed files to have a certain extension, and if you want a search option such as going through all subdirectories