C# MIDI Toolkit

ChannelMessageBuilder builder = new ChannelMessageBuilder();

    builder.Command = ChannelCommand.NoteOn;
    builder.MidiChannel = 0;
    builder.Data1 = 60;
    builder.Data2 = 127;
    builder.Build();

    outDevice.Send(builder.Result);

http://www.codeproject.com/KB/audio-video/MIDIToolkit.aspx

PC ONLY :(