主题：请教代码里如何指定打印机？

Dim Book As New XLS.Book(ProjectPath & "Attachments\客户订单.xls")
Dim fl As String = ProjectPath  & "Reports\客户订单.xls"
Book.Build() '生成细节区
Book.Save(fl) '保存工作簿

Dim App As New MSExcel.Application
Dim Wb As MSExcel.WorkBook = App.WorkBooks.Open(fl)
Dim Ws As MSExcel.WorkSheet = Wb.WorkSheets(1)

Ws.PrintOut(Preview:=True,ActivePrinter:="四联打印")