Question

I have two mirrored datatables (same structure with two primary keys) :

• DataTable_A —> bound to a datagridView
• DataTable_B —> filled from a database

Since DataTable_B is filled by a query into database every 2 seconds, I need to mirror the DataTable_A like DataTable_B avoiding filling directly DataTable_A. When a record disappears from DataTable_B i need to delete the record also from DataTable_A. What is the best way to do this ?

Right now I am doing a “for cycle” on each row of DataTable_B and if the row doesn’t exist on DataTable_A, I delete it.

Is there a better way to do it ?

Answer 1

The best way may be not to have a TableA at all but use a DataView on TableB. That would solve all problems at once. Can you elaborate on why you need the copy?

But otherwise you would want to handle the RowChanged and TableNewRow RowDeleted event of TableB

---

A more general idea, after seeing your comments: If it is possible to add a Timestamp column to the table in the database you can run a much more efficient query. And the DataTable.Merge method would do the rest.