PowerShell script to refresh training environment to most recent snapshot

#Refreshes the training system to the latest snapshot
connect-viserver viserver
$PSEmailserver = "SMTP.companyname.com"
$CurrentTrainingSnap = (get-snapshot Appserver** | sort-object -Property Created -Descending | select-object -ExpandProperty Name -First 1)
Set-VM Appserver** -Snapshot $CurrentTrainingSnap -Confirm:$false
Send-MailMessage -From "emailaddress" -To "emailaddress" -cc "emailaddress" -Subject "Appserver** has been refreshed"