Option Explicit
Dim Ws As Worksheet

'Pour le formulaire
Private Sub UserForm_Initialize()
    Dim J As Long
    Dim I As Integer
    
    ComboBox2.ColumnCount = 1 'Pour la liste déroulante Civilité
    ComboBox2.List() = Array("", "M.", "Mme", "Mlle")
    Set Ws = Sheets("Clients") 'Correspond au nom de votre onglet dans le fichier Excel
    With Me.ComboBox1
        For J = 2 To Ws.Range("A" & Rows.Count).End(xlUp).Row
            .AddItem Ws.Range("A" & J)
        Next J
    End With
    For I = 1 To 7
        Me.Controls("TextBox" & I).Visible = True
    Next I
End Sub

'Pour la liste déroulante Code client
Private Sub ComboBox1_Change()
    Dim Ligne As Long
    Dim I As Integer
    
    If Me.ComboBox1.ListIndex = -1 Then Exit Sub
    Ligne = Me.ComboBox1.ListIndex + 2
    ComboBox2 = Ws.Cells(Ligne, "B")
    For I = 1 To 7
        Me.Controls("TextBox" & I) = Ws.Cells(Ligne, I + 2)
    Next I
End Sub

'Pour le bouton Nouveau contact
Private Sub CommandButton1_Click()
    Dim L As Integer
    If MsgBox("Confirmez-vous l'insertion de ce nouveau contact ?", vbYesNo, "Demande de confirmation d'ajout") = vbYes Then
        L = Sheets("Clients").Range("a65536").End(xlUp).Row + 1 'Pour placer le nouvel enregistrement à la première ligne de tableau non vide
        Range("A" & L).Value = ComboBox1
        Range("B" & L).Value = ComboBox2
        Range("C" & L).Value = TextBox1
        Range("D" & L).Value = TextBox2
        Range("E" & L).Value = TextBox3
        Range("F" & L).Value = TextBox4
        Range("G" & L).Value = TextBox5
        Range("H" & L).Value = TextBox6
        Range("I" & L).Value = TextBox7
    End If
End Sub

'Pour le bouton Modifier
Private Sub CommandButton2_Click()
    Dim Ligne As Long
    Dim I As Integer
    
    If MsgBox("Confirmez-vous la modification de ce contact ?", vbYesNo, "Demande de confirmation de modification") = vbYes Then
        If Me.ComboBox1.ListIndex = -1 Then Exit Sub
        Ligne = Me.ComboBox1.ListIndex + 2
        Ws.Cells(Ligne, "B") = ComboBox2
        For I = 1 To 7
            If Me.Controls("TextBox" & I).Visible = True Then
                Ws.Cells(Ligne, I + 2) = Me.Controls("TextBox" & I)
            End If
        Next I
    End If
End Sub

'Pour le bouton Quitter
Private Sub CommandButton3_Click()
    Unload Me
End Sub