DataTable and Outer Join

Hello:

I totally messed up when asking the question.... Here is my problem
statement/ background

Background: My program reads an excel file and populates three datatables
depending on the value in one of the columns. Now when i create a
datarelation and try to combine the tables, I loose values that are unique
in the child tables. I want to make sure that even those values will get
transfered. Is there a way to go about this? That is why i was wondering if
there is a way i could program an OuterJoin, leftjoin or so. I could make
the two datatables, fill up excel sheets with that info and then start using
those table to make the outer join but wanted to make sure if there was an
easier way

All help would be appreciated,

Thank You


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