How to loop through user profiles in SharePoint 2010 and get a specific property

$url = "http://sharepointserver/"

$site = Get-SPSite $url

$context = Get-SPServiceContext $site

$profileManager = New-Object Microsoft.Office.Server.UserProfiles.UserProfileManager($context)

$profiles = $profileManager.GetEnumerator()

while ($profiles.MoveNext()) {

  $userProfile = $profiles.Current

  $name = $userProfile.DisplayName

  $myprop= $userProfile["MypropertyName"]

  Write-Host "$name;$myprop"

}