Powershell script to stop an IIS Application Pool

StopAppPool.ps1

# usage: StopAppPool.ps1 -AppPoolName DefaultAppPool
# set-executionpolicy remotesigned
# Document of WebAdministration:
#     https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/ee790599(v%3dtechnet.10)
# multiple parameters sample: param([string]$paramA,[string]$paramB)

param([string]$AppPoolName)

if ([string]::IsNullOrEmpty($AppPoolName))
{
    throw "Parameter AppPoolName is required."
}

Import-Module WebAdministration
$AppPoolState = Get-WebAppPoolState -Name $AppPoolName
if ($AppPoolState.Value -eq "Started")
{
    Stop-WebAppPool -Name $AppPoolName
    Write-Output "$($AppPoolName) stopped."
}
else
{
    Write-Output "$($AppPoolName) has already been stopped."
}