• https://msdn.microsoft.com/en-us/library/system.diagnostics.stopwatch%28v=vs.110%29.aspx?cs-save-lang=1&cs-lang=csharp#code-snippet-2

Public NotInheritable Class Form1 : Inherits Form
 
    Private stopwatchs As Stopwatch() = Enumerable.Repeat(New Stopwatch, 15).ToArray
    Friend Timer1 As New Windows.Forms.Timer With {.Interval = 1000, .Enabled = False}
 
    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        AddHandler Me.Timer1.Tick, AddressOf Timer1_Tick
    End Sub
 
    Private Sub Button1_Click() Handles Button1.Click
 
        ' Iniciar stopwatchs...
        For Each stw As Stopwatch In Me.stopwatchs
            stw.Start()
        Next stw
 
        Me.Timer1.Enabled = True
        Me.Timer1.Start()
 
    End Sub
 
    Private Sub Button2_Click() Handles Button2.Click
 
        ' Detener stopwatchs...
        For Each stw As Stopwatch In Me.stopwatchs
            stw.Stop()
        Next stw
 
        Me.Timer1.Stop()
        Me.Timer1.Enabled = False
 
    End Sub
 
    Private Sub Timer1_Tick(sender As Object, e As EventArgs)
 
        For Each stw As Stopwatch In Me.stopwatchs
            Console.WriteLine(stw.Elapsed.ToString)
        Next stw
 
    End Sub
 
End Class

using Microsoft.VisualBasic;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
public sealed class Form1 : Form
{
 
	private Stopwatch[] stopwatchs = Enumerable.Repeat(new Stopwatch(), 15).ToArray;
	internal Windows.Forms.Timer Timer1 = new Windows.Forms.Timer {
		Interval = 1000,
		Enabled = false
 
	};
	private void Form1_Load(object sender, EventArgs e)
	{
		this.Timer1.Tick += Timer1_Tick;
	}
 
 
	private void Button1_Click()
	{
		// Iniciar stopwatchs...
		foreach (Stopwatch stw in this.stopwatchs) {
			stw.Start();
		}
 
		this.Timer1.Enabled = true;
		this.Timer1.Start();
 
	}
 
 
	private void Button2_Click()
	{
		// Detener stopwatchs...
		foreach (Stopwatch stw in this.stopwatchs) {
			stw.Stop();
		}
 
		this.Timer1.Stop();
		this.Timer1.Enabled = false;
 
	}
 
 
	private void Timer1_Tick(object sender, EventArgs e)
	{
		foreach (Stopwatch stw in this.stopwatchs) {
			Console.WriteLine(stw.Elapsed.ToString);
		}
 
	}
	public Form1()
	{
		Load += Form1_Load;
	}
 
}
 
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