Comparing the current value with the previous one in Powershell

Question

Hi,
New to scripting and i was wondering how can I compare the current value with the previous value?
I am having trouble with the loop structure, and I am not sure I am on the right track...
I am trying to compare the record to next record in the same csv file after import-csv... My code runs fine, but is not giving the right result.
$FilePath = Get-FileName -initialDirectory "C:\"
#Testing for null
If($FilePath)
$Data = Import-csv -Path $FilePath | Sort-Object BUYER, {[int] $_.PO_NBR}, {[int] $_.LINE_NBR}
Foreach($fData in $Data)
$i = $fData
Foreach($i in $fData)
if($fData.Buyer -eq $i.Buyer)
#save all the same buyer name to a new variable
Write-Host "Same as previous"
Else
Write-Host "Variable is null"
Remove-Item function:\Get-FileName

Answer 1

Thank you. The Foreach loop is now working properly.
Can I ask what is the purpose of "-ea 0" in the import-csv? I can't seem to find "-ea" as a parameter for import-csv in help.
-ea is short for -ErrorAction.
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