Powershell joining two values

I have a list of files named according to the usersname.
I am able to gather the Surname and GivenName. I want to join the SN and GN as a single string. The purpose of this task is to rename the pst file to the users full name, but some of the display names are FN LN and others are LN, FN in AD.
I want standardize this output as LN, FN.

Just not sure how to go about that.  

Here is my line of code:

Import-Module ActiveDirectory
$ErrorActionPreference= 'silentlycontinue'
(Get-Content -Path "\\xchg\c$\PST.txt" | %{$_.TrimEnd(".PST")} ) | Foreach {Get-ADUser -Identity $_ | Select Surname,GivenName }

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LVL 27
yo_beeDirector of Information TechnologyAsked:
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Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
Import-Module ActiveDirectory
$ErrorActionPreference= 'silentlycontinue'
Get-Content -Path "\\xchg\c$\PST.txt" |
  % { Get-ADUser -Identity ($_ -replace '.PST' } |
  % { "$($_.SurName), $($_.GivenName)" }

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yo_beeDirector of Information TechnologyAuthor Commented:
Perfect results.  Thanks
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