Option Strict On
Option Explicit On
Public Class frmMain

    Private Sub btnDisplay_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDisplay.Click
        Dim n, s As Double
        n = CDbl(txtN.Text)
        s = CDbl(txtS.Text)
        lstIValues.Items.Clear()
        'Uses the user's input to determine the terminating value (n) and step value (s)
        For i As Double = 0 To n Step s
            'Adds i to the list
            lstIValues.Items.Add(i)
        Next
    End Sub
End Class