Option Explicit
Private Sub Command1_Click()
Dim i As Long
Dim nSum As Long
For i = 0 To List1.ListCount - 1
nSum = nSum + Val(List1.List(i))
Next i
Text1.Text = nSum
End Sub
Private Sub Form_Load()
Dim i As Long
For i = 1 To 15
List1.AddItem i
Next i
End Sub