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

$Form = New-Object system.Windows.Forms.Form
$Form.ClientSize = '686,420'
$Form.text = "Form"
$Form.TopMost = $false

$DataGridView1 = New-Object system.Windows.Forms.DataGridView
$DataGridView1.width = 454
$DataGridView1.height = 377
$DataGridView1.location = New-Object System.Drawing.Point(208,18)

$Button1 = New-Object system.Windows.Forms.Button
$Button1.text = "Datei einlesen"
$Button1.width = 176
$Button1.height = 376
$Button1.location = New-Object System.Drawing.Point(22,18)
$Button1.Font = 'Microsoft Sans Serif,10'

$Form.controls.AddRange(@($DataGridView1,$Button1))

$Column1 = New-Object System.Windows.Forms.DataGridViewTextboxColumn
$Column2 = New-Object System.Windows.Forms.DataGridViewTextboxColumn
$Column3 = New-Object System.Windows.Forms.DataGridViewTextboxColumn
$Column1.Width = 128
$Column2.Width = 128
$Column3.Width = 128

$Column1.Name = 'Kundennummer'
$Column2.Name = 'Vorname'
$Column3.Name = 'Nachname'
$DataGridView1.Columns.Add($Column1)
$DataGridView1.Columns.Add($Column2)
$DataGridView1.Columns.Add($Column3)

$Form.Controls.AddRange(($DataGridView1))

$Button1.add_click(
{
    $DataGridView1.Rows.Clear()
    $file = Get-Content -Path "kunden.txt"
    foreach ($line in $file)
    {
        $num = $line.split(";")[0]
        $vname = $line.split(";")[1]
        $nname = $line.split(";")[2]
        $DataGridView1.Rows.Add($num,$vname,$nname)
    }
})

Clear-Host
$Form.ShowDialog()