主题：请教:合并数据的问题.

Dim cmd As New SQLCommand
Dim dt As DataTable
cmd.C
cmd.CommandText = "SELECT * From {员工}"
dt = cmd.ExecuteReader()
For Each dr As DataRow In dt.DataRows
    If DataTables("员工").Find("sfzhm = '" & dr("身份证号") & "'") Is Nothing Then
        Dim nr As DataRow = DataTables("员工").AddNew()
        For Each dc As DataCol In dt.DataCols
            nr(dc.name) = dr(dc.name)
        Next
    End If
Next

以上代码是:合并数据源名称为"text" 中的 "员工"表到本项目中的:"员工" 表
且条件是"身份证号码"相同时,则跳过....

而以下这个代码:

Dim Book As New XLS.Book("c:\test\订单.xls")
Dim Sheet As XLS.Sheet = Book.Sheets(0)
Tables("订单").StopRedraw()
'注意以下数组中列名称的顺序,必须和Excel表中的列顺序一致
Dim nms() As String = {"产品","客户","雇员","单价","折扣","数量","日期"}
'注意下面的循环变量从1开始，而不是从0开始，因为Excel表的第一行是标题
For n As Integer = 1 To Sheet.Rows.Count -1
    Dim r As Row = Tables("订单").AddNew()
    For m As Integer = 0 To nms.Length - 1
         r(nms(m)) = Sheet(n,m).Value
    Next
Next
Tables("订单").ResumeRedraw()

能否给它增加一个条件,当订单编号相同时,则跳过.

由于太多