I've thought about playing some simple violin pieces on the bass and there'll be transposing involved. I would just like to know if it is appropriate to use the enharmonic equivalent instead of a double accidental. For example, the piece being originally in C major and I would transpose it to E major, and there was an A# in the piece, so should I write as a C# (the other accidental being in the key signature) or would D natural be acceptable (or would it completely butcher the harmonic idea, or something like that)? My theory knowledge has a load of holes in it... The last time I went to a music theory class was when I was about 8, so sorry about my ignorance.