A stopwatch program measure the amount of time elapsed from a particular time when it is activated to the time when it is deactivated. 

Code:

Public Class Form1
    Inherits System.Windows.Forms.Form
    Dim sec, min, msec, hr As Integer
    
     Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Timer1.Start()
        Timer1.Interval = 100
        msec = 0
        sec = 0
        min = 0
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Timer1.Stop()
    End Sub

    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick

        If msec = 10 Then
            sec = sec + 1
            msec = 0
        End If

        If sec = 60 Then

            min = min + 1
            sec = 0
        End If
        If min = 60 Then
            hr = hr + 1
            min = 0
        End If

        Label6.Text = hr
        Label3.Text = min
        Label2.Text = sec
        Label1.Text = msec

        msec = msec + 1
    End Sub
    
    End Class