XNA uses C#.
I'm going to port some games from blitz to XNA, you could probably do it quite easily by wrapping a few XNA commands into blitz3D syntax. You'd still need to adjust all your lines to have ;'s on the end though and all the other sytax used in the program. you could use the blitzSDK with C++ though yes. Not sure if it's just a case of cutting and pasting your blitz code into the class window in C++ though.
I'm going to port some games from blitz to XNA, you could probably do it quite easily by wrapping a few XNA commands into blitz3D syntax. You'd still need to adjust all your lines to have ;'s on the end though and all the other sytax used in the program. you could use the blitzSDK with C++ though yes. Not sure if it's just a case of cutting and pasting your blitz code into the class window in C++ though.