RobyDX (Translated into English by Google) has a huge number of tutorials using managed DirectX on his website. They are all in VB.Net which is great to see since most other tutorials are in c#. For those of you who don't speak fluent Italian, google does a great job of translating. I expect some nuances are lost but its certainly good enough to find your way to the source code.

He has sample code for Direct3d, DirectDraw, DirectInput and DirectSound and topics from beginner to advanced shaders. A lot of hard work went into producing this many samples