Powershell popup to close applications - powershell

Question

I want to create powershell file that will create a popup to warn someone that an application will close automatically in 15 mins unless they extend a session. It should then kill the application unless they extend the session.
I’m completely new to this and this is all I have mustered trying it with the notepad application.
Add-Type -AssemblyName PresentationCore,PresentationFramework
$ButtonType = [System.Windows.MessageBoxButton]::YesNoCancel
$MessageIcon = [System.Windows.MessageBoxImage]::Error
$MessageBody = "Can we close notepad?"
$MessageTitle = "Using Notepad"
$Result = [System.Windows.MessageBox]::Show($MessageBody, $MessageTitle, $ButtonType, $MessageIcon)
Write-Host "Your choice is $Result"
Get-Process Notepad | Foreach-Object { $_.CloseMainWindow() | Out-Null }

Answer 1

Mathias, if you change this to a switch it works like you want where it takes Yes to close the window, but No and cancel leave it open
Add-Type -AssemblyName PresentationCore,PresentationFramework
$ButtonType = [System.Windows.MessageBoxButton]::YesNoCancel
$MessageIcon = [System.Windows.MessageBoxImage]::Error
$MessageBody = "Can we close notepad?"
$MessageTitle = "Using Notepad"
$Result = [System.Windows.MessageBox]::Show($MessageBody, $MessageTitle, $ButtonType, $MessageIcon)
switch($Result){
"Yes" {
write-host "You selected $Result"
Get-Process notepad | Foreach-Object { $_.CloseMainWindow() | Out-Null } | Stop-Process -Force
}
"No" {
Write-Host "You selected $Result"
}
"Cancel" {
Write-Host "You selected $Result"
}
}