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I'm trying to create a gui with comboboxes and textboxes. If the user select a item from the Combobox, the related values from an array should appears in textboxes. Can someone give me a clue? I already tried to enumerat thru the arrays and select the key/value pair with -eq, but unfortunately I was not able to solve it this way.

Add-Type -AssemblyName System.Windows.Forms
[System.Windows.Forms.Application]::EnableVisualStyles()


#Arrays
$CB_NDL_Array = @
 City1 = @
 Street = "Test1"
 Postalcode = "5435"
 
 City2 = @
 Street="Test2"
 Postalcode="23423"
 
 City3 = @
 Street="Test3"
 Postalcode="234"
 

 $UserManager.controls.AddRange(@($Vorname,$Nachname,$TB_Givenname,$TB_Surname,$Anmeldename,$TB_SamAccountName,$Passwort,$TB_Password,$Niederlassung,$CB_NDL,$Street,$TB_Streetaddress,$City,$TB_City,$PLZ,$TB_Postalcode,$Buero,$TB_Office,$Abteilung,$TB_Department,$Position,$CB_Title,$Firma,$CB_Company,$Manager,$TB_Manager,$Telefon,$TB_OfficePhone,$Mobile,$TB_Mobile,$UserInfo,$Exchange,$RB_exc_yes,$RB_exc_no,$Email_address,$TB_email_address,$CB_Database,$Database,$B_Create))



$CB_NDL = New-Object system.Windows.Forms.ComboBox
$CB_NDL.text = ""
$CB_NDL.width = 100
$CB_NDL.height = 20
$CB_NDL.location = New-Object System.Drawing.Point(110,180)
$CB_NDL.Font = 'Microsoft Sans Serif,10'
$CB_NDL.SelectedItem


$Street = New-Object system.Windows.Forms.Label
$Street.text = "Strasse"
$Street.AutoSize = $true
$Street.width = 25
$Street.height = 10
$Street.location = New-Object System.Drawing.Point(15,210)
$Street.Font = 'Microsoft Sans Serif,10'

$TB_Streetaddress = New-Object system.Windows.Forms.TextBox
$TB_Streetaddress.multiline = $false
$TB_Streetaddress.width = 100
$TB_Streetaddress.height = 20
$TB_Streetaddress.location = New-Object System.Drawing.Point(110,210)
$TB_Streetaddress.Font = 'Microsoft Sans Serif,10'

$City = New-Object system.Windows.Forms.Label
$City.text = "Ort"
$City.AutoSize = $true
$City.width = 25
$City.height = 10
$City.location = New-Object System.Drawing.Point(15,240)
$City.Font = 'Microsoft Sans Serif,10'

$TB_City = New-Object system.Windows.Forms.TextBox
$TB_City.multiline = $false
$TB_City.width = 100
$TB_City.height = 20
$TB_City.location = New-Object System.Drawing.Point(110,240)
$TB_City.Font = 'Microsoft Sans Serif,10'


$PLZ = New-Object system.Windows.Forms.Label
$PLZ.text = "PLZ"
$PLZ.AutoSize = $true
$PLZ.width = 25
$PLZ.height = 10
$PLZ.location = New-Object System.Drawing.Point(15,270)
$PLZ.Font = 'Microsoft Sans Serif,10'

$TB_Postalcode = New-Object system.Windows.Forms.TextBox
$TB_Postalcode.multiline = $false
$TB_Postalcode.width = 100
$TB_Postalcode.height = 20
$TB_Postalcode.location = New-Object System.Drawing.Point(110,270)
$TB_Postalcode.Font = 'Microsoft Sans Serif,10' 

$CB_NDL.Add_SelectedIndexChanged(
$TB_City.text = $CB_NDL.SelectedItem
$TB_Postalcode.text = $CB_NDL_Array.values )

 foreach ($NDL in $CB_NDL_Array.keys)
 $CB_NDL.items.AddRange("$NDL")
 

foreach ($Title in $CB_Title_Array)
 $CB_Title.items.add("$Title")
 

foreach ($Company in $CB_Company_Array)
 $CB_Company.items.add("$Company")
 
 [void]$UserManager.ShowDialog()

$SelectedItem=$CB_NDL.SelectedItem
$TB_Postalcode.text = $CB_NDL_Array.$SelectedItem.Postalcode