主题：目录树问题

If e.Form.Controls("TreeView1").node.level = 1 Then
Dim Book As New XLS.Book(ProjectPath & "Attachments\转学信息.xls")
Dim fl As String = ProjectPath & "Reports\转学信息.xls"
Book.Build()
Book.Save(fl)
Dim App As New MSExcel.Application
Dim Wb As MSExcel.WorkBook = App.WorkBooks.Open(fl)
Dim Ws As MSExcel.WorkSheet = Wb.WorkSheets(1)
App.Visible = True
End If

If e.Form.Controls("TreeView1").node.level = 1 Then

这里错了，怎样改？谢谢