A C425 PLT STARTED A DSCNT TOO SOON AND DSNDED THROUGH BAB CLASS C AIRSPACE WITHOUT BEING IN RADIO COM. THE PLT BECAME IMPATIENT WITH THE APCH CTLR AND CANCELED IFR AND STARTED DOWN WITHOUT COORDINATING ENTRY INTO BAB AIRSPACE.

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WAS IFR AT 13000 FT OVER SMF (JUST N) AND MOST CLOUDS WERE BEHIND US (DEPARTED OAK). ASKED FOR LOWER AND A VISUAL APCH. SOMEHOW THE CTLR'S RESPONSE WAS NOT VERY EFFICIENT CONSIDERING I WANTED TO DSND 'NOW' AND GO DIRECT TO MYV FOR LNDG. SO I CANCELED IFR AND INITIATED A STEEP DSCNT TO SET UP FOR RWY 14 (L DOWNWIND WITH A XWIND ENTRY). THE CTLR GAVE ME A FREQ CHANGE ABOUT 9 MI FROM THE ARPT AND I WAS ABOUT 7000 FT. I SOON CALLED MY POS ON THE MYV CTAF; ENTERED THE PATTERN AND LANDED. EVERYTHING WAS FINE EXCEPT FOR ONE THING -- I FLEW THROUGH BEALE'S (4100-1600 FT) CLASS C AIRSPACE WHILE DSNDING TO MY PATTERN ALT. I DIDN'T EVEN THINK ABOUT THIS; ASSUMING THE CTLR THOUGHT MY DSCNT PROFILE WAS OK. ON A FLT FROM OAK TO MYV 2 DAYS LATER; THE CTLR DID THE SAME THING. THIS TIME I REQUESTED TO STAY WITH HIM UNTIL BELOW THE CLASS C AT MYV. HE SAID NOT TO WORRY ABOUT IT BECAUSE HE HAD NO OTHER TFC IN THE BEALE CLASS C AIRSPACE; THEN HE HAD ME CONTACT MYV CTAF; ETC. OH WELL! I HAD MY BOSS IN THE R SEAT SO I WAS A LITTLE NERVOUS AND TRYING TO FLY LIKE I THOUGHT HE WOULD LIKE; RATHER THAN JUST RELAX AND EXHIBIT MY NORMALLY EXPERT FLYING SKILLS. I SHOULD HAVE QUESTIONED THE CTLR THE FIRST FLT THE WAY I DID ON THE SECOND. I HAD ALSO FLOWN INTO MYV MANY TIMES BEFORE IN A C402 AND BEEN HANDED OFF THE SAME WAY; BUT WAS MUCH LOWER -- BUT COME TO THINK OF IT; I HAVE DONE THIS ERROR BEFORE. I ASSUME THE SACRAMENTO CTLRS DON'T MIND NOT BEING IN TOUCH WITH CERTAIN FLTS AS THEY FLY THROUGH THE EDGE OF BEALE CLASS C AIRSPACE TOWARDS MYV.