at the moment im thinking that modes are wierd. ive got that the Dorian mode starts on the second note of the major scale, so if you were in Cmaj and playing the Dorian, you'd be playing D Dorian, right?

So you'd use the Dorian if you wanted to solo over a C rooted song in D? Or a Mixolydian if you wanted to solo over a C rooted song in G?

I also heard something about the Dorian being basically a mjor scale and an excersice involved playing up the Major scale, say at the 3rd fret (G), and then down the Dorian at the 5th fret ending on the 3rd fret 6th string... have I remembered correctly? Sorry to take your time about something this trivial