AN SMA ON LNDG EXPERIENCED NOSE GEAR AND MAIN GEAR FAILURE. ALL LNDG GEAR INDICATIONS AND WARNING SYS WERE NORMAL PRIOR TO TOUCHDOWN.

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I CALLED FOR A WX BRIEFING AND FILED AN IFR FLT PLAN AT XA00. I DROVE TO THE ARPT AND PERFORMED A PREFLT INSPECTION AND FOUND NO ABNORMALITIES. I RECEIVED ATIS; GOT MY CLRNC; TAXIED TO THE RUN-UP AREA; PERFORMED THE BEFORE TKOF CHKLIST AND FOUND NO ABNORMALITIES. I WAS CLRED FOR TKOF. CLBOUT WAS VERY TURBULENT BUT SMOOTHED OUT WITH ALT. I RAISED THE GEAR AFTER LIFTOFF AND THEN THE FLAPS. THERE WERE NO ABNORMALITIES. DURING CRUISE THERE WERE NO ABNORMALITIES. I RECEIVED ATIS AND WAS CLRED FOR DSCNT. 5 MI OUT FROM MYR I SLOWED TO 130 KTS AND EXTENDED THE GEAR AND VERIFIED IT WAS IN LOCKED POS BY LOOKING AT THE GREEN LIGHT ON THE PANEL AND THE INDICATOR ON THE FLOOR BTWN THE SEATS. 1 MI FROM THE THRESHOLD I DID MY GUMP CHK AND VERIFIED THAT THE GEAR WAS IN LOCKED POS. I SLOWED THE ACFT TO 100 KTS AND THEN LOWERED THE FLAPS TO FULL DOWN POS. OVER THE THRESHOLD I SLOWED THE ACFT TO 75 KTS AND I TOUCHED DOWN VERY SOFTLY. AS SOON AS THE WHEELS WERE ON THE GND THE NOSE DROPPED ABRUPTLY AND THE ACFT SLID TO A STOP. TWR CTL ASKED WHAT HAD HAPPENED AND IF I WAS OK. I TOLD HER I THOUGHT THE NOSE GEAR HAD COLLAPSED AND THAT I WAS OK. I TURNED OFF THE MAIN SWITCH; THE STROBES; THE ELECTRIC TRIM SWITCH AND I CLBED OUT OF THE ACFT. WHEN I LOOKED BACK I SAW THAT THE ENTIRE GEAR HAD COLLAPSED AND THE ACFT WAS ON ITS BELLY. THE MAINS WERE DROPPING TO THE GND AND THE NOSE GEAR WAS IN ITS WELL AND THE GEAR DOORS CLOSED. THE RESCUE TEAM ARRIVED AND I VERIFIED THE FUEL LEVER WAS OFF AND THE GEAR SWITCH WAS DOWN.