Gemme i excell i VB.NET 2005

Hej,

Jeg kan ikke oprette og gemme data i en excell fil.

Jeg får følgende fejl når jeg eksekverer nedenstående kode:
Invalid index. (Exception from HRESULT: 0x8002000B (DISP_E_BADINDEX))

Fejlen opstår her:
xlWorkSheet = xlWorkBook.Sheets("sheet1")

Jeg anvender office 2010 - Komponentet Microsoft Excell 14 Version 1.7.

Koden:

Imports Excel = Microsoft.Office.Interop.Excel

Public Class Form1

    Private Sub Button1_Click(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.ReleaseComObject(obj)
            obj = Nothing
        Catch ex As Exception
            obj = Nothing
        Finally
            GC.Collect()
        End Try
    End Sub

End Class




Nogen som kan hjælpe?

/Kenneth