System.Windows.Forms.TextBox not displaying output - windows

Question

I am trying to create a GUI for my script that will go and delete certain files that match a certain name that is older than a set time period in a directory and show a what if before deleting. Everything was going well until I tried to put the output into a Textbox. The output displays in the console fine but won't display in the textbox. I have narrowed it down to the command I am running, as if I simply remove it and run 'ping google.com' it outputs fine. Please find my code below:
$scanbutton.Location = '380,84'
$scanbutton.text = 'Scan Directory'
$scanbutton.height = 25
$scanbutton.Width = 100
$scanbutton.Add_Click({
$result.Text = get-childitem $folderBrowser.SelectedPath -include "cat*.png" -force -recurse | where-object { (-not $_.PSIsContainer) -and ($_.LastWriteTime -lt (get-date).AddDays(-0)) } | remove-item -whatif
#$result.Text = ping google.com
$Form.Controls.Add($result)
})
Anyone have any ideas why this is? I am still very new to all this so please be nice. Also how can I get the output to follow new lines like in the console? At the moment it just has it as one long string (when I do ping). Please let me know if you need anything else from me.
Thank you in advance.
IC

Answer 1

As commented, the Remove-Item cmdlet does not return anything you can capture as text in a textbox. Neither does the -WhatIf switch, which like Write-Host is designed to not return anything, but write directly onto the console.
In your case, you can create and write your own info in the TextBox. Something like:
$resultBox = [System.Windows.Forms.TextBox]::new()
# do the Location, Size and whatever it takes here
# make the textbox accept multiple lines of text
$resultBox.Multiline = $true
# add the control to the form after you have created it
# NOT inside the $scanbutton.Add_Click() event handler
$Form.Controls.Add($resultBox)
$scanbutton.Add_Click({
# get a list of files to remove (just the FullNames)
$filesToRemove = Get-ChildItem $folderBrowser.SelectedPath -Filter "cat*.png" -File -Force -Recurse |
Where-Object { ($_.LastWriteTime -lt (Get-Date).AddDays(-60).Date) } |
Select-Object -ExpandProperty FullName
# write the file FullNames in the textbox
$resultBox.Text = "Removing files:`r`n{0}" -f ($filesToRemove -join [environment]::NewLine)
$filesToRemove | Remove-Item -WhatIf
})