Create a midi file using vb

I am doing a mini vb program on midi files. I need help on how to create a midi file that only plays the musical notes. When the user press a key like C or A, the proocedure simply generate a midi tone that corresponds to only the pressed character and after ward saved the press character in midi form

You can get the key pressed in the keypressed event or you can use the keydown or KeyUp events beyond that would need more info from you.

the MIDI format is available for download, except that it is over 900 pages of text.