主题：想在这段代码前价格判断 ，如果数据被复制过，就不执行

想在这段代码前价格判断 ，如果数据被复制过，就只复制新的数据，不再复制之前已经复制过的数据

Dim Cols1() As String = {"tanumru","jiecun","chuanhuoc","tasallnum","shangpinming","cord"}
Dim Cols2() As String = {"in","jie","chuanhuo","xiaoshou","name","cord"}

For Each dr1 As DataRow In DataTables("product").Select("[newnum]<>0")
    Dim dr2 As DataRow = DataTables("kucun").AddNew()
    
    For i As Integer = 0 To Cols1.Length -1
        dr2(Cols2(i)) = dr1(Cols1(i))
        
    Next
Next

If Tables("xiaoshou").Current IsNot Nothing Then
    Dim p As String = Tables("xiaoshou").Current("time1")
    
    Dim Book1 As New XLS.Book(ProjectPath & "Attachments\库存.xls") '打开模板
    Dim fl1 As String = ProjectPath & "Reports\库存.xls"
    Dim Sheet1 As XLS.Sheet = Book1.Sheets(0)
    Book1.Build() '生成报表
    Book1.Save(fl1)
    Dim Proc1 As New Process
    Proc1.File = fl1
    Book1.Save("c:\mifeng\kucun\" & p & format(Date.Now, "ddhhmm") & "库存.xls")
    Proc1.Start()
    msgbox(2)
    Dim Book2 As New XLS.Book(ProjectPath & "Attachments\明细.xls") '打开模板
    Dim fl2 As String = ProjectPath & "Reports\明细.xls"
    Dim Sheet2 As XLS.Sheet = Book2.Sheets(0)
    Book2.Build() '生成报表
    Book2.Save(fl2)
    Dim Proc2 As New Process
    Proc2.File = fl2
    Book2.Save("c:\mifeng\mingxi\" & p & format(Date.Now, "ddhhmm") & "明细.xls")
    Proc2.Start()
End If