主题：数据复制到后台

以下代码是销售明细表数复制到生产计划表,2个表是在已经加载的情况下复制的,如果生产计划表没有加载,直接复制到后台的生产计划表,代码如何?

'勾选[排产]后复制数据到生产计划,取消勾选则删除
If e.DataCol.Name = "排产" Then
    If e.DataRow("排产") = True Then
        'Dim tr As DataRow =DataTables("销售明细").find("订单编号 ='" & e.DataRow("订单编号") & "'") '只能找到1条记录
        Dim trs As List(Of DataRow) = DataTables("销售订单明细").Select("订单编号 ='" & e.DataRow("订单编号") & "'")
        For Each tr As DataRow In trs
        If tr IsNot Nothing Then
            Dim nma() As String = {"订单编号","客户","产品分类","产品型号","产品规格","订单数量","交货日期","备注"} '销售明细表数据来源列
            Dim nmb() As String = {"订单编号","客户","产品分类","产品型号","产品规格","订单数量","交货日期","生产要求"} '生产计划表数据接收列
            Dim dr As DataRow = DataTables("生产计划").AddNew
            For i As Integer = 0 To nma.Length - 1
                dr(nmb(i)) = tr(nma(i))
            Next
        End If
        Next
    Else
        If e.DataRow("排产") = False Then
            DataTables("生产计划").DeleteFor("订单编号 = '" & e.DataRow("订单编号")& "'")
        End If
    End If
End If

1、如果加载表则要一同加载与生产计划相关联的表，我不想这样。

2、用数据合并的方法，如何修改我上面的代码？

Dim cmd As New SQLCommand
Dim dt As DataTable
cmd.ConnectionName = "数据源名称"
cmd.CommandText = "SELECT * From {生产计划} where 1=2"
dt = cmd.ExecuteReader(True)

vars("生产计划") = dt

1、以上代码能否写在窗口的AferLoad；2、如果生产计划表已经加载了有影响吗？