Private Sub CommandButton1_Click()
Dim Man As Range
Yo = TextBox1
Sheets("Sommaire de factures").Select
Set Man = Columns("D:D").Find(What:=Yo, LookAt:=xlWhole)
If Man Is Nothing Then
Sheets("Commandes").Select
MsgBox "Facture inexistante"
Else
Man.Activate
MsgBox "Cette facture à déjà été envoyée"
End If
UserForm1.Hide
End Sub