C210 PLT LOST ACFT CTL AND WENT OFF THE RWY WHEN LNDG IN STRONG XWINDS.

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ATX ACFT PART 135 CARGO PIC. I APCHED DODGE CITY; KS (DDC) ARPT. THE WIND WAS RPTED AS BEING 320 DEGS AT 21 KTS GUSTING 28 KTS OR THEREABOUTS. RWY 32/14 AT DDC WAS NOTAM CLOSED. THEREFORE THE ONLY RWY AVAILABLE WAS RWY 2/20. I ATTEMPTED TO LAND ON RWY 2. I FLEW THE TFC PATTERN NORMALLY THROUGH DOWNWIND; BASE AND FINAL ON RWY 2. HOWEVER; AS I ATTEMPTED TO ROUND OUT FOR LNDG ON RWY 2; I STARTED TO LOSE CTL OF THE ACFT AND ROLLED OFF RWY 2 AND FINALLY BROUGHT THE ACFT TO A STOP ON THE GRASS. HAVING ROLLED OFF THE RWY; NARROWLY MISSED CONTACT WITH A RWY EDGE LIGHT AND HALTED THE ACFT ON GRASS AREA SHORT OF RWY 32 WITHOUT DAMAGE. I CONSULTED WITH THE C210 POH (PLT OPERATING HANDBOOK) AND CONFIRMED THAT THE MAX DEMONSTRATED XWIND COMPONENT OF C210 IS 21 KTS. ON MY EVENING RETURN FLT I DIVERTED TO GARDEN CITY; KS (GCU) WHICH HAS A RWY 31; WHEN ON LISTENING TO AWOS; THE WIND HAD NOT IMPROVED. THE LESSON IS CHK PREDICTED WIND AT ETA; PARTICULARLY AT AN ARPT WITH SINGLE RWY. CHK RWYS AVAILABLE; BE AWARE OF XWIND COMPONENT; BE PREPARED TO DIVERT TO AN ARPT WITH A MORE SUITABLE CHOICE OF RWYS.