looping SQL Query within Foreach loop

Hi Guys,

I am trying to merge the values I have in an external file with the result from sql query but there is something that sql query keeps only the result from first loop:

Below is the script I have:

$lines = Get-Content 'c:\firstsecondnames.txt'

$DBs = "192.168.1.1"

$DB = "DBA"

$ConnectionTimeout = 90

$QueryTimeout = 90

foreach ($ln in $lines)

    {

    $vala  = $line.Split(',')[0]

    $valb  = $line.Split(',')[1]

    #DB query

     $Query = "select ValC from dbo.PROCESSED_INTERCHANGES where Firstname = '$vala' and middlename = '$valb'

        $conn=new-object System.Data.SqlClient.SQLConnection

    $ConnectionString = "Server={0};Database={1};Integrated Security=True;Connect Timeout={2}" -f $DBs,$DB,$ConnectionTimeout

    $conn.ConnectionString=$ConnectionString

    $conn.Open()

    $cmd=new-object system.Data.SqlClient.SqlCommand($Query,$conn)

    $cmd.CommandTimeout=$QueryTimeout

    $ds=New-Object system.Data.DataSet

    $da=New-Object system.Data.SqlClient.SqlDataAdapter($cmd)

    [void]$da.fill($ds)

    $conn.Close()

    $conn.Dispose()

    $valC= $row

    $fullname = $vala + $valb + $valC

    Write-Host $fullname

}