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Tip: Merge Two DataTables, Preserving the Old Values

Learn how to maintain all the old values when merging two databases.


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The datatable1.Merge(datatable2) statement will merge datatable2 into datatable1. You cannot retrieve the old values in the datatable1 after the merge happens.

A quick way to do that, is by creating a copy of the first datatable and then doing the merge in the following way.

Dim dtMerged As DataTable = New DataTable() 
dtMergerd = datatable1.Copy() 
dtMerged.Merge(datatable2, True)


 

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