Powershell code to combine to AD attribute strings

In the past I've used the following VBscript code to combine two Active Directory objects into one string.  

      PasswordA = Left(oUser.Lastname,3) & Right=(oUser.adminDisplayName,5)
      PasswordB = Ucase(PasswordA)

I need to write this same code in Powershell and place it in a CSV file.  Recommendations on the most efficient method?
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$passwordA = "string1" + "string2"
$passwordb = $passwordA.ToUpper()

FYI Powershell Zone: http://www.experts-exchange.com/Programming/Languages/Scripting/MSH-Monad/

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VB Script

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