PLT OF C172 LANDS ON TXWY. SUN POS BLINDS HIM ON TURN TO FINAL. NO CONFLICT.

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CLRED TO LAND RWY 19L IAD. CTLR WANTED CLOSE IN APCH. SUN IN EYES ON TURN TO FINAL AND FINAL. MISTOOK TXWY FOR RWY. DUE TO THE CLOSE APCH; LITTLE TIME ON FINAL TO CORRECT ERROR. I WAS BLINDED LONG ENOUGH BY THE SUN TO GET TRAPPED ON WRONG APCH TO LNDG. I WAS ON A L BASE FOR RWY 19L FURTHER OUT EARLIER. HOWEVER; THE CTLR WANTED ME TO FLY DIRECTLY TO THE ARPT. I WOULD LIKE TO DISCUSS THIS INCIDENT WITH AN ANALYST OVER THE PHONE. I DON'T KNOW HOW TO CORRECT THIS PROB OTHER THAN GETTING SOME ADDITIONAL FLT INSTRUCTION ON CLOSE IN WORK INTO THE SUN AT A LARGE ARPT. I WILL CERTAINLY GET THIS ADDITIONAL INSTRUCTION PROMPTLY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THE ACFT IS A C172. THE FSDO HAS CONTACTED HIM AND HE WILL PROBABLY MAKE A VISIT TO THE LCL OFFICE. HE HAS TAKEN SOME TRAINING REGARDING CLOSE AND UNUSUAL APCH PROCS. THE INCIDENT OCCURRED WHEN THE SUN WAS AT ITS LOWEST ON THE HORIZON DURING THE WINTER MONTHS. THE RPTR LANDED ON TXWY. RWY HAD BEEN CHANGED FROM LNDG N TO LNDG S. HIS APCH WAS ALTERED BY ATC TO BE SHORT AND TIGHT.