Timer

Public Class Form1
    Dim sw As New Stopwatch

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Label1.Text = "00:00:00"
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Timer1.Start()
        sw.Start()
    End Sub

    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        Label1.Text = sw.Elapsed.ToString.Remove(8)
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        If Label1.Text = "00:00:00" Then Exit Sub
        sw.Stop()
        Timer1.Stop()
        Button1.Text = "Restart"
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        sw.Stop()
        Timer1.Stop()
        sw.Reset()
        Label1.Text = "00:00:00"
        Button1.Text = "Start"
    End Sub