powershell gui creating local users - powershell

Question

i need some help with my powershell gui. i want to create a gui for creating local useraccounts with some parameters provided in the checkbox i need to click. the gui is running but i need some help for the code lines for the checkboxes. what do i need to add that the code is running fone when i click the checkboxes? for example if i just click checkbox 1 i get an error the username is to long even i name the testaccount "testuser"
$PSDefaultParameterValues['*:Encoding'] = 'ascii'
Add-Type -AssemblyName System.Windows.Forms
Add-Type -AssemblyName System.Drawing
#create form
$form = New-Object System.Windows.Forms.Form
$form.Width = 500
$form.Height = 400
$form.MaximizeBox = $false
$form.TopMost = $true
$objLabel = New-Object System.Windows.Forms.label
$objLabel.Location = New-Object System.Drawing.Size(10,20)
$objLabel.Size = New-Object System.Drawing.Size(130,15)
$objLabel.BackColor = "Transparent"
$objLabel.ForeColor = "Black"
$objLabel.Text = "name"
$Form.Controls.Add($objLabel)
#textbox with choosen user name
$txtBox = New-Object System.Windows.Forms.TextBox
$txtBox.Location = New-Object System.Drawing.Point (180, 20)
$txtBox.Size = New-Object System.Drawing.Size(280,100)
$form.Controls.Add($txtBox)
$objLabel2 = New-Object System.Windows.Forms.label
$objLabel2.Location = New-Object System.Drawing.Size(10,50)
$objLabel2.Size = New-Object System.Drawing.Size(130,15)
$objLabel2.BackColor = "Transparent"
$objLabel2.ForeColor = "Black"
$objLabel2.Text = "password"
$Form.Controls.Add($objLabel2)
#textbox with choosen password
$txtBox2 = New-Object System.Windows.Forms.TextBox
$txtBox2.Location = New-Object System.Drawing.Point (180, 50)
$txtBox2.Size = New-Object System.Drawing.Size(280,100)
$form.Controls.Add($txtBox2)
#create checkbox1
$checkBox = New-Object System.Windows.Forms.CheckBox
$checkBox.Location = New-Object System.Drawing.Point (10, 100)
$checkBox.Size = New-Object System.Drawing.Size(350,30)
$checkBox.Text = "PasswordNeverExpires"
$form.Controls.Add($checkBox)
#create checkbox2
$checkBox2 = New-Object System.Windows.Forms.CheckBox
$checkBox2.Location = New-Object System.Drawing.Point (10, 150)
$checkBox2.Size = New-Object System.Drawing.Size(350,30)
$checkBox2.Text = "UserMayChangePassword"
$form.Controls.Add($checkBox2)
#create checkbox2
$checkBox3 = New-Object System.Windows.Forms.CheckBox
$checkBox3.Location = New-Object System.Drawing.Point (10, 200)
$checkBox3.Size = New-Object System.Drawing.Size(350,30)
$checkBox3.Text = "AccountNeverExpires"
$form.Controls.Add($checkBox3)
#create user button
$Button = New-Object System.Windows.Forms.Button
$Button.Location = New-Object System.Drawing.Size(10,250)
$Button.Size = New-Object System.Drawing.Size(150,50)
$Button.Text = "create user"
$Button.Add_Click({
if(($checkBox.Checked -eq $false) -and ($checkBox2.Checked -eq $false) -and ($checkBox3.Checked -eq $false)) {
[System.Windows.Forms.Messagebox]::Show("No CheckBox checked")
}
#checkbox1 action
if ($checkBox.Checked -eq $true) {
$adminName = $txtBox
$securePassword = $txtBox2
$newUser = New-LocalUser -Name $adminName -Password $securePassword -Description $adminName -FullName $adminName #-ErrorAction Stop
$newUser | Set-LocalUser <#-PasswordNeverExpires $true#> -UserMayChangePassword $false <#-AccountNeverExpires#> #-ErrorAction Stop
Add-LocalGroupMember -Group "Administrators" -Member $adminName #-ErrorAction Stop
if(-not $?) {[System.Windows.Forms.MessageBox]::Show( "no success",'','OK',"Error")}
else {[System.Windows.Forms.MessageBox]::Show( "success",'','OK',"Information")}
}
#checkbox2 action
if ($checkBox2.Checked -eq $true) {
if(-not $?) {[System.Windows.Forms.MessageBox]::Show( "no success",'','OK',"Error")}
else {[System.Windows.Forms.MessageBox]::Show( "success",'','OK',"Information")}
}
#checkbox3 action
if ($checkBox3.Checked -eq $true) {
if(-not $?) {[System.Windows.Forms.MessageBox]::Show( "no success",'','OK',"Error")}
else {[System.Windows.Forms.MessageBox]::Show( "success",'','OK',"Information")}
}
})
$form.Controls.Add($Button2)
#end
[void]$form.ShowDialog()