Populate listbox from a selected.item in another listbox - winforms

Question

Good day to you all!
I have a Powershell program that I am making for my company. I have 2 listbox, one with the make of printers and the other will be for the models of printers. I was hoping for help to populate the 'model' list with what the user selects in the 'make' list. I understand doing a selecteditem could work, but whatever I do, it doesn't populate the 'model' list.
This is my first time programming and am self-taught. Right now, I am using Windows.Forms to make the GUI.
Any help is appreciated. Thank you so much for this wonderful community of like-minded awesomeness!
*Code:
Add-Type -AssemblyName System.Windows.Forms
$Form_Service = New-Object system.Windows.Forms.Form
$Form_Service.ClientSize = '452,400'
$Form_Service.text = "Service Call"
$Form_Service.TopMost = $true
$Form_Service.StartPosition = 'CenterScreen'
$Label_ValleyID = New-Object system.Windows.Forms.Label
$Label_ValleyID.text = "Enter Valley ID"
$Label_ValleyID.AutoSize = $true
$Label_ValleyID.width= 25
$Label_ValleyID.height = 10
$Label_ValleyID.location = New-Object System.Drawing.Point(45,41)
$Label_ValleyID.Font = 'Microsoft Sans Serif,10'
$TextBox_ValleyID= New-Object system.Windows.Forms.TextBox
$TextBox_ValleyID.multiline= $false
$TextBox_ValleyID.width= 180
$TextBox_ValleyID.height = 20
$TextBox_ValleyID.location = New-Object System.Drawing.Point(45,62)
$TextBox_ValleyID.Font = 'Microsoft Sans Serif,10'
$Label_Make= New-Object system.Windows.Forms.Label
$Label_Make.text = "Make"
$Label_Make.AutoSize = $true
$Label_Make.width= 25
$Label_Make.height = 10
$Label_Make.location = New-Object System.Drawing.Point(45,108)
$Label_Make.Font = 'Microsoft Sans Serif,10'
$ListBox_Make= New-Object system.Windows.Forms.ListBox
$ListBox_Make.text = "Make"
$ListBox_Make.width= 144
$ListBox_Make.height = 50
$ListBox_Make.location = New-Object System.Drawing.Point(45,129)
[void] $ListBox_Make.Items.Add('Brother')
[void] $ListBox_Make.Items.Add('Canon')
[void] $ListBox_Make.Items.Add('HP')
[void] $ListBox_Make.Items.Add('Kyocera')
[void] $ListBox_Make.Items.Add('Ricoh')
[void] $ListBox_Make.Items.Add('Sharp')
$Label_Model = New-Object system.Windows.Forms.Label
$Label_Model.text= "Model"
$Label_Model.AutoSize= $true
$Label_Model.width = 25
$Label_Model.height= 10
$Label_Model.location= New-Object System.Drawing.Point(259,108)
$Label_Model.Font= 'Microsoft Sans Serif,10'
$ListBox_Model = New-Object system.Windows.Forms.ListBox
$ListBox_Model.text= "Model"
$ListBox_Model.width = 146
$ListBox_Model.height= 50
$ListBox_Model.location= New-Object System.Drawing.Point(259,129)
$Label_Location= New-Object system.Windows.Forms.Label
$Label_Location.text = "Location"
$Label_Location.AutoSize = $true
$Label_Location.width= 25
$Label_Location.height = 10
$Label_Location.location = New-Object System.Drawing.Point(45,195)
$Label_Location.Font = 'Microsoft Sans Serif,10'
$TextBox_Location= New-Object system.Windows.Forms.TextBox
$TextBox_Location.multiline= $false
$TextBox_Location.width= 363
$TextBox_Location.height = 20
$TextBox_Location.location = New-Object System.Drawing.Point(45,215)
$TextBox_Location.Font = 'Microsoft Sans Serif,10'
$Label_Problem = New-Object system.Windows.Forms.Label
$Label_Problem.text= "State what is wrong:"
$Label_Problem.AutoSize= $true
$Label_Problem.width = 25
$Label_Problem.height= 10
$Label_Problem.location= New-Object System.Drawing.Point(45,250)
$Label_Problem.Font= 'Microsoft Sans Serif,10'
$TextBox_Problem = New-Object system.Windows.Forms.TextBox
$TextBox_Problem.multiline = $false
$TextBox_Problem.width = 364
$TextBox_Problem.height= 100
$TextBox_Problem.location= New-Object System.Drawing.Point(45,270)
$TextBox_Problem.Font= 'Microsoft Sans Serif,10'
$CheckBox_Nope = New-Object system.Windows.Forms.CheckBox
$CheckBox_Nope.text= "Is your printer inoperable?"
$CheckBox_Nope.width = 250
$CheckBox_Nope.height= 50
$CheckBox_Nope.location= New-Object System.Drawing.Point(145,295)
$CheckBox_Nope.Font = 'Microsoft Sans Serif,10'
$Button_Submit = New-Object system.Windows.Forms.Button
$Button_Submit.text= "Submit"
$Button_Submit.width = 70
$Button_Submit.height= 30
$Button_Submit.location= New-Object System.Drawing.Point(189,345)
$Button_Submit.Font= 'Microsoft Sans Serif,10'
$Form_Service.controls.AddRange(#($Label_ValleyID,$Label_Make,$Label_Model,$Label_Location,$Label_Problem,$TextBox_ValleyID,$ListBox_Make,$ListBox_Model,$TextBox_Location,$TextBox_Problem,$Button_Submit,$CheckBox_Nope))
if ($ListBox_Make.SelectedItem -eq "Brother"){
[void] $ListBox_Model.Items.Add('MP301')
}
[void]$Form_Service.ShowDialog()

Answer 1

OK so what you are looking for is called events. Events are actions that take place that then allow you to run code after the action. Like when Mouse Clicks on a object or Keyboard button is pressed.
In Powershell when dealing with Winforms you can use
$Control.Add_EventName{
Code Here
}
Put the events after the controls are already called. I usally put them right before i show a form.
$ListBox_Make.Add_Click{
$ListBox_Model.Items.Add($ListBox_Make.SelectedItem)
}
[void]$Form_Service.ShowDialog()
in your exact case you could use :
$ListBox_Make.Add_Click{
if ($ListBox_Make.SelectedItem -eq "Brother"){
[void] $ListBox_Model.Items.Add('MP301')
}
}
Hopefully this puts you on the right track.
Also instead of a bunch of if Statements try a Switch instead
$ListBox_Make.Add_Click{
switch ($ListBox_Make.SelectedItem){
"Brother"{
$ListBox_Model.Items.Add('MP301')
}
"Canon"{
$ListBox_Model.Items.Add('LT45')
}
"HP"{
$ListBox_Model.Items.Add('ABC2133')
}
}
}
You can find the events for listbox
https://learn.microsoft.com/en-us/dotnet/api/system.windows.forms.listbox?view=netframework-4.7.2#events