主题：[求助]如何将一个表的数据加入到另一个表里面？

我想利用excel导入订单数据到一个表中，再利用代码判断导入的单号是否已存在主表里，然后将主表不存在的订单写入主表。求大

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点击浏览该文件:财务账单.rar

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Dim dlg As New OpenFileDialog
dlg.Filter = "Excel文件|*.xls;*.xlsx"
If dlg.ShowDialog =DialogResult.OK Then
    Dim t As Table = Tables("出库明细导入")
    t.ResumeRedraw()
    t.StopRedraw()
    Dim Book As New XLS.Book(dlg.FileName)
    Dim Sheet As XLS.Sheet = Book.Sheets("出库明细")
    For n As Integer = 1 To Sheet.Rows.Count -1
        If sheet(n,5).text > "" Then
            Dim r As DataRow = t.DataTable.Find("出库单号 = '" & sheet(n, 5).text & "' and 数量 = '" & sheet(n, 6).text & "'")
            If r Is Nothing Then r = t.DataTable.AddNew()
            For i As Integer = 0 To sheet.Cols.Count -1
                Dim cname As String = sheet(0, i).text
                If cname > "" AndAlso t.Cols.Contains(cname) Then
                    r(cname) = sheet(n, i).Text
                End If
            Next
        End If
    Next
    t.ResumeRedraw()
End If