Convert Array into a single string and get full-path file name after doing a Get-ChildItem

hi, using get-childitem in location list of files specific file-extension, storing results array. trying convert array single-string contain file names full-path , comma (, ) seperator in between. getting file-name inside whole table.

$location = "e:\procserver\allprocess"
$filelist = get-childitem -path $location -recurse -include "*.txt", "*.log"
$result = $filelist | out-string
$result

directory: e:\ques

mode                lastwritetime     length name                                                                                                                            
----                -------------     ------ ----                                                                                                                            
-a---         9/20/2012   7:34          2 proc.log
-a---         9/20/2012   6:23          2 step.txt
-a---         7/16/2012   7:43          2 qwet.log

the string should , stored in $result, can use $result other purposes:
$result="e:\procserver\allprocess\proc.log, e:\procserver\allprocess\step.txt, e:\procserver\allprocess\qwet.log"

$result = (get-childitem -path $location -recurse -include "*.txt", "*.log" | foreach {$_.fullname}) -join ","

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