output Arrays with headers....

Hi,
hopefully a simple question with a simple answer....

I Initialise an array, No problems,

$Global:myData = @()

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I have an array populated in a loop, no problems.

{

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I add to the array in an inside loop, again no problems

$myUser = Get-QADUser $username | Select Name, Email
$Global:myData += $myUser

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I output the array contents, no problem FIRST time through but read on....

}
$myData | Sort Name | Select Name, Email -Unique

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I reinitialise the array and loop back to next itteration...

$Global:myData = @()
	}

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Now on the FIRST run through the loop i get output with column names of Name and  Email nicely underlined with the array data below listed nicely. On subsequent iterations of the loop, no column headings show?

How do i force it to show these headers with eacho output of $myData?

Thanks