Updating a DataSet and Not updating the Database

[VBNovice05]

I am trying to update a DataSet and DataView without updating the
database. I have two datasets.

DataSet1: Name Size

DataSet2: Name Size Path
I want to look through DataSet2 and if any items from DataSet1 have the
same name I want to update the size of the file in DataSet2.

What is the best way to do this?

Thanks in advance