GA PLT PENETRATES IAD CLASS B AIRSPACE WITHOUT A CLRNC.

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I OPENED MY VFR FLT PLAN WITH CLARKSBURG APCH. (I COULD NOT RAISE AN FSS.) THE RTE OF FLT WAS FROM WAY DIRECT TO 2W6. INITIALLY; I COULD ONLY REACH 3800 FT BECAUSE OF THE CLOUDS ABOVE THE MOST WESTERN RIDGE OF THE ALLEGHENY MOUNTAINS. CLARKSBURG APCH GAVE ME A SQUAWK CODE. SOON I WAS ABLE TO CLB TO 5500 FT. APCH ADVISED ME TO CONTACT ZOB. ZOB ADVISED ME TO CONTACT ZDC. ZDC ASSIGNED ME A SQUAWK CODE. AFTER A FEW MINS; CTR CALLED ME AND ADVISED THAT THEY HAD NOT FORGOTTEN ABOUT ME; BUT THEY WERE NOT RECEIVING MY XPONDER AT THAT ALT. THEY ADVISED ME TO REMAIN ON THEIR FREQ AND TO KEEP MY ASSIGNED SQUAWK CODE. THEY SAID THEY SHOULD PICK ME UP SOMEWHERE ABOUT 25 MI NW OF MARTINSBURG. I CALLED ZDC 3 OR 4 TIMES TO LEARN ABOUT ANY TFC IN THE DULLES AREA; BUT I GOT NO ANSWER. I KNEW THAT I WAS ABOUT 25 NM FROM IAD ARPT. WHEN I COULD NOT RAISE ZDC AFTER THE THIRD OR FOURTH TRY; I LOOKED UP DULLES APCH'S FREQ FOR THE W. AFTER INITIAL CONTACT; APCH ASSIGNED ME ANOTHER FREQ. BY THE TIME THE SECOND CTLR WAS ABLE TO ANSWER ME; I WAS ABOUT 1 MI INSIDE DULLES C CLASS B AIRSPACE. THE CTLR ADVISED ME THAT I WAS IN VIOLATION FO ENTERING CLASS B AIRSPACE WITHOUT CLRNC. I ADVISED HIM THAT ZDC ASSIGNED ME A SQUAWK CODE BUT I COULD NOT RAISE THEM. I TOOK IT UPON MYSELF TO CALL DULLES APCH SINCE I THOUGHT THAT I WAS GETTING CLOSE TO THEIR AIRSPACE. THE CTLR ADVISED THAT EVEN THOUGH CTR SHOULD HAVE EFFECTED A HDOF; I STILL WAS NOT PERMITTED INTO THEIR AIRSPACE WITHOUT CONTACTING DULLES FIRST. THE CTLR SAID THAT THERE WAS NO PROB THIS TIME; BUT TO BE AWARE THAT ENTRY INTO CLASS B AIRSPACE CAN ONLY BE GRANTED BY THE CTLING AGENCY AND NOT CTR. I THINK THAT THIS SIT COULD HAVE BEEN AVOIDED IF ZDC WOULD HAVE HANDED ME OFF TO DULLES APCH. IN THE FUTURE; I WILL INQUIRE OF CTR TO SEE IF THEY ARE GOING TO HAND ME OFF AND IF I CAN'T RAISE THEM; I'LL IMMEDIATELY CONTACT APCH. I'LL START THIS PROCESS AT LEAST 15 MI BEFORE GETTING TO THE OUTER BOUNDARY OF CLASS B AIRSPACE.