$dc = Get-ADDomainController -Filter { isglobalcatalog -eq $true }
# $strMachineName = import-csv .\computer_name.csv
foreach ($line in $dc.name)
{
    try {
        $reg = [Microsoft.Win32.RegistryKey]::OpenRemoteBaseKey('LocalMachine', $line)
        $regkey = $reg.OpenSubkey("SYSTEM\\CurrentControlSet\\Services\\Netlogon\\Parameters")
        $returnkey = $regkey.GetValue("DBFlag")

        ('{0},{1}' -f $line, $returnkey) #| out-file C:\stdout.csv -append -encoding ascii
    } catch {
        ('{0},{1}' -f $line, $_) #| out-file C:\stderr.csv -append -encoding ascii
    }
}