主题：从数据库表复制一列的内容到另一新建表的同名列的问题

Dim Vals As List(of String())
Vals = DataTables("来源表").GetValues("产品|客户")
For i As Integer = 0 To Vals.Count - 1
    if DataTables("接收表").Find("产品 = '" & Vals(i)(0) & "' And 客户 = '" & Vals(i)(1) & "'") Is Nothing then
        Dim dr As DataRow = DataTables("接收表").AddNew()
        dr("产品") = Vals(i)(0)
        dr("客户") = Vals(i)(1)
    end if
Next
 
怎么判断不存在，你应该会的。