all'inizio del codice ho messo questo:


Imports Excel = Microsoft.Office.Interop.Excel
Public Class Form1
Private Sub Button1_Click_2(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim xlApp As Excel.Application
Dim xlWorkBook As Excel.Workbook
Dim xlWorkSheet As Excel.Worksheet
Dim misValue As Object = System.Reflection.Missing.Value

xlApp = New Excel.ApplicationClass
xlWorkBook = xlApp.Workbooks.Add(misValue)
xlWorkSheet = xlWorkBook.Sheets("sheet1")
xlWorkSheet.Cells(1, 1) = "http://vb.net-informations.com"
xlWorkSheet.SaveAs("C:\vbexcel.xlsx")

xlWorkBook.Close()
xlApp.Quit()

releaseObject(xlApp)
releaseObject(xlWorkBook)
releaseObject(xlWorkSheet)

MsgBox("Excel file created , you can find the file c:\")
End Sub

Private Sub releaseObject(ByVal obj As Object)
Try
System.Runtime.InteropServices.Marshal.ReleaseComO bject(obj)
obj = Nothing
Catch ex As Exception
obj = Nothing
Finally
GC.Collect()
End Try
End Sub
Protected Overrides Sub Finalize()
MyBase.Finalize()
End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
End
End Sub

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
Me.Hide()
Form2.Show()
End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)

End Sub

Private Sub Button1_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs)

End Sub
End Class


ma mi dà un errore: "Impossibile incorporare il tipo di interoperabilità 'ApplicationClass'. In alternativa utilizzare l'interfaccia applicabile" cioè? mi manca una libreria?