比如:
Dim Cols1() As String = {"第一列","第二列"}
For Each dr1 As DataRow In DataTables("表A").DataRows
If DataTables("表B").find("第一列='" & dr1("第一列") & "'") Is Nothing Then
Dim dr2 As DataRow = DataTables("表B").AddNew()
For i As Integer = 0 To Cols1.Length -1
dr2(Cols1(i)) = dr1(Cols1(i))
Next
End If
Next