How to correctly assign a string in Power Shell?

Question

PowerShell

When executing the code:

$watch = [System.Diagnostics.Stopwatch]::StartNew()
$watch.Start()                                        #Запуск таймера
Start-Sleep 1
$watch.Stop()                                         #Остановка таймера
$s = "Время выполнения: "
$t = Write-Host $watch.Elapsed                        #Время выполнения
$s = $s + $t.ToString()

An error pops up: "Unable to call a method on an expression with a null value."

Can you please tell me how to assign a string so that the error does not pop up?

Answer 1

$watch = [System.Diagnostics.Stopwatch]::StartNew()
$watch.Start() #Start timer
Start-Sleep 1
$watch.Stop() #Stop timer
Write-Host "Runtime:"$watch.Elapsed

Answer 2

$watch = [System.Diagnostics.Stopwatch]::StartNew()
$watch.Start()                                        #Запуск таймера
Start-Sleep 1
$watch.Stop()                                         #Остановка таймера
$s = "Время выполнения: "
Write-Host $watch.Elapsed
$t = $watch.Elapsed                     #Время выполнения
$s = $s + $t.ToString()