CESSNA PLT COORDINATES WITH TRACON FOR IFR THROUGH CLASS B. AFTER AIRBORNE FROM UNCTLED ARPT AND APCHING CLASS B HE RECEIVES NO COOPERATION FROM CTLR.

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VIA TELEPHONE; I CALLED TO BALTIMORE APCH CTL TO PICK UP IFR DEP CLRNC AND VOID TIME; THIS IS NORMAL PROC FOR IFR DEPS FROM UNCTLED ESSEX SKYPARK. THE CTLR EXPLAINED THEY WERE RATHER BUSY AND IT WOULD HELP THEM IF I DEPARTED VFR; AND PICKED UP THE CLRNC WHILE AIRBORNE. I AGREED SINCE WX WAS GOOD VFR. HE WENT ON TO GIVE ME A ROUTING; DEP FREQ AND SQUAWK CODE. HE SAID I SHOULD DEPART WITH THIS SQUAWK; AND HE'D HAVE OUR INFO AT THE 119.7 CTLR WHO WOULD BE PREPARED AND EXPECTING OUR AIRPLANE. ON OUR CLBOUT I CALLED THE CTLR AND ASKED TO PICK UP OUR CLRNC AND WAS ABRUPTLY TOLD TO 'STAY OUT OF CLASS B AIRSPACE; I'M BUSY NOW.' I EXPLAINED WE WERE TOLD HE'D BE EXPECTING US; AND GOT THE SAME RESPONSE. AFTER PROCEEDING VFR FOR 5 PLUS OR MINUS MINS -- OUTSIDE CLASS B AIRSPACE WAS CONFIRMED BY OUR GPS MOVING MAP; THE CTLR TOLD US TO CLB TO 3000 FT 300 DEG HDG. I THEN ASKED TWICE IF WE WERE THEN IFR AND CLRED INTO CLASS B AIRSPACE; AND GOT THE SAME HEADING AND ALT VECTOR. THE CTLR DID NOT CONFIRM OUR IFR CLRNC; OR CLRNC INTO CLASS B AIRSPACE. WE TRIED TO COOPERATE TO EASE THE CTLR'S WORKLOAD; AND THE RESULT WAS POOR TREATMENT ALMOST ADVERSARIAL DIRECTION/HEADING REQUEST. THIS SCENARIO HAS HAPPENED MANY TIMES AT OUR ARPT AND IS UNNECESSARY AND DETRACTS FROM SAFE OPS.