Get Displayname from samaccountname

Hey Gang,

Need some help I am trying to get the display name from Samaccount this is this what I have 

$user = Get-Content 'C:\Temp\User.txt'

$results = @()

Foreach($user in $Users)

{

$result +=Get-QADUser -Identity $User.Samaccountname | select displayname,Samaccountname

}

$result| Export-Csv C:\Temp\Test12.csv -notype

When I ran it I get nothing!!! No error MSG just back to the prompt.  I can run it as this

Get-Content 'C:\temp\User.txt'| %{Get-QADUser -Identity $_ | Select Displayname, SamAccountName}