hi, can someone please help me, i have added a progress bar and i added a start and stop button, the start is working fine, but i dont know the coding for the stop button could someone please tell me the coding for the stop button please, here is my codng for the start button, any help would be appreciated, thanks

Code:
Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim num As Integer
        For num = 1 To 100
            ProgressBar1.Value = num
            lblCounter.Text = Format(num / 100, "p")
            lblCounter.Refresh()
            Threading.Thread.Sleep(100)
            lblvfound.Visible = True

            lblvfound2.Visible = False
            If lblCounter.Text = "100.00 %" Then
                lblvfound2.Visible = True
            ElseIf lblCounter.Text = "0.10 %" Then
                lblvfound.Visible = True
            End If

        Next
        MsgBox("The Virus Scanning Is Complete", MsgBoxStyle.OkOnly)

    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

    End Sub