Bonjour je passe de vba a vb.net et j'essais de manipuler un fichier exel mais petit soucis , tres simple mais pour mois !!!!

voici le code dans forms1

Code : Sélectionner tout - Visualiser dans une fenêtre à part
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Imports Excel = Microsoft.Office.Interop.Excel
Public Class Form1
    Dim APP As New Excel.Application
    Dim worksheet As Excel.Worksheet
    Dim workbook As Excel.Workbook
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        'FormBorderStyle = Windows.Forms.FormBorderStyle.None
        workbook = APP.Workbooks.Open("I:\x.xlsx")
        worksheet = workbook.Worksheets("Feuil1")
        APP.Visible = True 'Optionnel
 
    End Sub
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        worksheet.Cells(1, 1).Value = TextBox1.Text
        worksheet.Cells(1, 2).Value = TextBox2.Text
    End Sub
 
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        worksheet.Cells(5, 6).Formula() = "=SUM(A1:B1)"
 
 
 
    End Sub
    Private Sub Form1_FormClosed(ByVal sender As System.Object, _
 ByVal e As System.Windows.Forms.FormClosedEventArgs) _
  'Handles MyBase.FormClosed
 
        'workbook.Save()
        'workbook.Close()
        'APP.Quit()
 
    End Sub
 
    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        worksheet.Cells(1, 1).Value = 56
        worksheet.Cells(1, 7).Value = "ouio"
    End Sub
 
    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        Me.Close()
 
 
    End Sub
 
    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
        Form2.Show() ' ouvrir une form
        Me.Close() ' c'est pour fermer une forme
 
 
    End Sub
End Class
 
tous fonctionne tres bien mais quand je passe a la form2 je n'arrive a ecrire dans le fichier excel nommé x
voici le code :
Imports Excel = Microsoft.Office.Interop.Excel
Public Class Form2
    Dim app As Excel.Application
    Dim worksheet As Excel.Worksheet
    Dim workbook As Excel.Workbook
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Form1.Show()
        Me.Close()
 
 
    End Sub
 
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
 
        worksheet.Cells(1, 7).Value = "ouio"
 
    End Sub
 
    Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
 
        workbook = app.Workbook("I:\x.xlsx")
        worksheet = workbook.Worksheets("Feuil1")
    End Sub
 
End Class
Merci de votre aide je debute vraiment
Greg