How to make the result showing one time and make the result to csv file?

My script having problem of showing out all the AD computer name result  from Active Directory once when running it and storing the result to csv file. I am a newbie in AD and powershell.

This is the code:

$strADPathFile = "D:\Powershell for AD\ADPathList.txt"
$strErrLogFile = "D:\powershell for AD\errorADComputer.log"

$arrADPath = Get-Content -Path $strADPathFile

foreach ($strADPath in $arrADPath)
{        
    
    try
    {
    
        $objSearch = New-Object DirectoryServices.DirectorySearcher
        $objSearch.Filter = '(objectCategory=computer)'
        $objSearch.SearchRoot = $strADPath
        $objSearch.SearchScope = "Subtree"    
        $objSearch.PageSize = 1000    
        $objResults = $objSearch.Findall()
        write-host "Retrieving AD computer information in the domain $strDomain" 

        write-host "Number of AD Computer Name result: "$objResults.Count

        foreach($objResult in $objResults){  

            $objComputer = $objResult.GetDirectoryEntry()  
            write-host $objComputer.dNSHostName
            try
            {               
              #  InsertSQLTable $objComputer
            }
            catch
            {
                write-host $error[0]
                $strError = $objComputer.dNSHostName + "  " + $dateNow + $error[0]
                Add-Content $strErrLogFile $strError
            }

        }
    }
    catch
    {
        write-host $error[0]
    }

}

Export-Csv D:\PowerShellforAD\test2.csv

This is the error that I had get is that it will get the result for 2nd time again.

By the way, what is InputObject about? I had research some of it and still did not quite get it. Can anyone explain? Thanks