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VISUAL STUDIO VB - Problems with two databases - moving data

I have two problems - my application hooks up to two databases. Cross database querying is not allowed.
1. I am pulling from one database. but need to filter that dataset on ids that exist in the other - so there are no dupes.
my other problem is
2. once I have that dataset - how do I insert it into the other database?
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Senior Developer
Create a temporary table and insert the data. Then use that table to query it.
John RugoSenior SQL DBA

Create two datasets/datatables.  Populate each one at a time, connecting and disconnecting.  Do your logic within the app and then connect to the database that you want to update.