WinForms need timer with refresh

Hi all

I have a code for citrix farm that calculates available licenses. That all works fine. I just want some sort of auto refresh incorporated, i tried using timer and do a button perform click type of thing, but realized that my timer runs only once without the whole while loop. Does anyone have any suggestions on this?

[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Drawing") 
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms") 
$Server = "ctxlcw8k1v"
$otherLicenses = "385"
$Pool = Get-WmiObject -class "Citrix_GT_License_Pool" -Namespace "ROOT\CitrixLicensing" -ComputerName $Server
# Calculate licenses in use, total number of licenses and percentage currently in use  
$InUse = ($Pool | Measure-Object -Property InUseCount -sum).Sum
$Installed = (($Pool | Measure-Object -Property Count -sum).Sum) - $otherLicenses
$Percentage = [math]::round(($InUse/$Installed)*100,2)
$left = $installed-$inuse
$objForm = New-Object System.Windows.Forms.Form 
$objForm.Text = "Citrix Licenses Count"
$objForm.Size = New-Object System.Drawing.Size(300,200) 
$objForm.Font = New-Object System.Drawing.Font("Times New Roman", "11")
$objForm.StartPosition = "CenterScreen"
$objForm.KeyPreview = $True
$objForm.Add_KeyDown({if ($_.KeyCode -eq "R") 
    {$RefreshButton.PerformClick()}})
$objForm.Add_KeyDown({if ($_.KeyCode -eq "C") 
    {$objForm.Close()}})
    
$objLabel = New-Object System.Windows.Forms.Label
$objLabel.Location = New-Object System.Drawing.Size(20,40) 
$objLabel.Size = New-Object System.Drawing.Size(280,20) 
$objLabel.Text = "Licenses left: $left/$installed (In use: $percentage%)"
$objForm.Controls.Add($objLabel) 
$RefreshButton = New-Object System.Windows.Forms.Button
$RefreshButton.Location = New-Object System.Drawing.Size(75,120)
$RefreshButton.Size = New-Object System.Drawing.Size(75,23)
$RefreshButton.Text = "Refresh"
$RefreshButton.Add_Click({ 
$Pool = Get-WmiObject -class "Citrix_GT_License_Pool" -Namespace "ROOT\CitrixLicensing" -ComputerName $Server
$InUse = ($Pool | Measure-Object -Property InUseCount -sum).Sum
$Installed = (($Pool | Measure-Object -Property Count -sum).Sum) - $otherLicenses
$Percentage = [math]::round(($InUse/$Installed)*100,2)
$left = $installed-$inuse
$objLabel.Text = "Licenses left: $left/$installed (In use: $percentage%)"
$objForm.Refresh()})
$objForm.Controls.Add($RefreshButton)
$CloseButton = New-Object System.Windows.Forms.Button
$CloseButton.Location = New-Object System.Drawing.Size(150,120)
$CloseButton.Size = New-Object System.Drawing.Size(75,23)
$CloseButton.Text = "Close"
$CloseButton.Add_Click({$objForm.Close()})
$objForm.Controls.Add($CloseButton)
$objForm.Topmost = $True
$objForm.Add_Shown({$objForm.Activate()})
[void] $objForm.ShowDialog()