That's an ID3 tag specifically for mp3 files, it's located in the file header, and editing them from .NET is actually fairly difficult. Your best bet is to look for a tutorial by searching for something like "ID3 tags VB .NET". You'll probably get even better results if you search for "ID3 tags C#", but a lot of people don't want to see C#, as if it will give them a rash.

Now, in the Windows App or whatever they call it platform, there's some stuff to manipulate these if I remember right. But you can't use them from a plain old Desktop app.