Bonjour,
Et de cette façon ? Quelques petites modifs :
Sub Tri()
Dim Plage As Range
With Worksheets("Feuil1"): Set Plage = .Range(.Cells(1, 1), .Cells(.Rows.Count, 3).End(xlUp)): End With
Application.ScreenUpdating = False
Plage.Sort Plage(1, 3), xlAscending, Plage(1, 1), , xlAscending, , , xlYes
Plage.Borders.Weight = xlThin
Plage.Offset(1).Rows.AutoFit
Application.ScreenUpdating = True
ActiveWorkbook.Save
End Sub