Private Sub cmdFermer_Click()
With Sheets(CStr(Me.ComboBox1))
.Range("A1") = IIf(TextBox1.Value <> "", TextBox1.Value, .Range("A1"))
.Range("B1") = IIf(TextBox2.Value <> "", TextBox2.Value, .Range("B1"))
.Range("C1") = IIf(TextBox3.Value <> "", TextBox3.Value, .Range("C1"))
End With
Unload Me
End Sub