HOW TO GET TABLE NAME FROM DATASET OF JOINED QUERY

SIR

I AM MAKING MY DATASET THROUGH CODING.  DATAADAPTER, CONNECTION AND ALL OTHER THINGS I AM CREATING THROUGH MY CODE.  I MADE A DATASET FROM A QUERY.  THIS QUERY JOINING THREE TABLES.  I AM USING ALIAS FOR SOME FIELDS.  FROM DATASET I WANT TO KNOW THE FIELDS BELONG TO WHICH TABLE IN MY DATABASE, NOT IN TABLE NAME SPECIFIED IN DATASET.  I AM NOT USING XML.  SOME  FIELDS NAME ARE  COMMON IN ALL TABLES IN MY DATABASE.  SO I USED ALIAS.  PLEASE HELP ME TO GET TABLE NAME(IN DATABASE) OF EACH FIELDS IN MY QUERY. IT IS VERY URGENT. PLEASE ...

THANKS