[VBA]Alimenter une listbox sans doublons et par ordre alphabétique

PrivateSub UserForm_Initialize()
Dim c As Range
Dim tablo()
Dim i As Integer, j As Integer
Dim temp As String
Dim present As Boolean

ReDim tablo(1 To 1)
tablo(1) = Cells(1, 1)
For Each c In Sheets("Feuil1").Range("A1:A" & Range("a65536").End(xlUp).Row)
    present = False
    For i = 1 To UBound(tablo)
        If tablo(i) = c Then present = True
    Next i
    If Not present Then
        ReDim Preserve tablo(1 To UBound(tablo) + 1)
        tablo(UBound(tablo)) = c
    End If
    For i = 1 To UBound(tablo)
        For j = 1 To UBound(tablo)
            If tablo(i) < tablo(j) Then
                temp = tablo(i)
                tablo(i) = tablo(j)
                tablo(j) = temp
            End If
        Next j
    Next i
Next c

ListBox1.List = tablo

End Sub