Newbie: manually outputting to CSV

Given this simple script;

$timestamp = Get-Date -Format "yyyy/MM/dd HH:mm"
$computer_name = (Get-WmiObject win32_computersystem | select
name).name

output_header
output_body($timestamp,$computer_name,"COMPUTER_NAME",$computer_name,
"", "")

function output_header
{
$label = "TIMESTAMP","SOURCE","ELEMENT","VALUE1","VALUE2","VALUE3"
$csvstring = Join-String $label -Separator "~"
$csvstring
}

function output_body([string] $ts,[string] $src,[string] $v1,[string]
$v2,[string] $v3)
{
$line = $ts, $src, $v1, $v2, $v3
$csvstring2 = Join-String $line -Separator "~"
$csvstring2
}

Why does it output the body portion differently than the header
portion, see below;

TIMESTAMP~SOURCE~ELEMENT~VALUE1~VALUE2~VALUE3
2008/07/04 09:59 FBYC3F1 COMPUTER_NAME FBYC3F1 ~~~~

Hi Kurt, output_body $timestamp $computer_name ... In PowerShell, () causes powershell wrapping the items into array. So all of
arguments stored in $ts.

Best regards,
Tao Ma

"Kurt" <kharless@xxxxxx>
??????:8a46f05d-913d-4d48-8896-78cc06b623d2@xxxxxx