Merge Two DataTables, Preserving the Old Values

Merge Two DataTables, Preserving the Old Values

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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