ASP.net Excel versions

Hi

The following code works with .xls (or 2003 and older file). How do I upgrade it to work with .xlsm and .xlsx  files too?

Protected Sub ButtonUploadFile_Click(ByVal sender As Object, ByVal e As System.EventArgs) _
      Handles ButtonUploadFile.Click

      If FileUploadExcel.HasFile Then
         Try
            ' alter path for your project
            FileUploadExcel.SaveAs(Server.MapPath("~/ExcelImport.xls"))
            LabelUpload.Text="Upload File Name: " & _
                FileUploadExcel.PostedFile.FileName & "<br>" & _
                "Type: " & _
                FileUploadExcel.PostedFile.ContentType & _
                " File Size: " & _
                FileUploadExcel.PostedFile.ContentLength & " kb<br>"
         Catch ex As Exception
            LabelUpload.Text="Error: " & ex.Message.ToString
         End Try
      Else
         LabelUpload.Text="Please select a file to upload."
      End If

   End Sub

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