Question Compter

function lot(){
    if ( $textbox_4.Text.StartsWith("MER01") -eq $True)
        { $i = "40000"
          $imax = 59999}
    elseif ($textbox_4.Text.StartsWith("MER02") -eq $True)
        {$i = "60000"
         $imax = "79999"}
    elseif ($textbox_4.Text.StartsWith("GEV05") -xor $textbox_4.Text.StartsWith("GEV10") -xor $textbox_4.Text.StartsWith("GEV19"))
        {$i = "80000"
         $imax = "99999"}
         
        
        }
        
$button_enr.Add_Click(
{
    if ( $textbox_1.Text -eq "")
        { Write-Host " Erreur de saisie"}
    elseif ( $textbox_2.Text -eq "")
        { Write-Host " Erreur de saisie"}
    elseif ( $textbox_3.Text -eq "")
        { Write-Host " Erreur de saisie"}
    elseif ( $textbox_4.Text -eq "")
        { Write-Host " Erreur de saisie"}
    elseif ( -not $textbox_4.Text.StartsWith("GEV") -xor $textbox_4.Text.StartsWith("MER")-xor ($textbox_4.Text -eq ("URAINTERNE")) -xor $textbox_4.Text -eq ("BAT5MP")) 
       { Write-Host "Erreur d'emplacement"}
    else{
    $ope = $textbox_1.Text
    $cart = $textbox_2.Text.Substring(1)
    $qut = $textbox_3.Text
    $emp = $textbox_4.Text
    $lot = lot
    
    $id = Get-Content $fichier | where {$_ -cmatch $cart} | foreach {$_ -csplit $cart}
    $id2 = $id[1]
    Add-Content -Path $stock -Value $ope';'$id2';'"entrée"';'$date';'""';'$qut';'"Pce(s)"';'$emp';'""';'$lot
             
             $textbox_2.Clear()
             $textbox_3.Clear()
             $textbox_4.Clear()
             $textbox_2.focus()
             }
             while ($i -le $imax){
              }
      })