Columns in ListView

Hello, 

I try to appear the columns in my ListView but it does'nt work with this code :

$ListView1 = New-Object System.Windows.Forms.ListView
$System_Drawing_Point = New-Object System.Drawing.Point 
$System_Drawing_Point.X = 255 
$System_Drawing_Point.Y = 61
$listView1.Location = $System_Drawing_Point
$listView1.Name = "listView1"
$System_Drawing_Size = New-Object System.Drawing.Size 
$System_Drawing_Size.Width = 562 
$System_Drawing_Size.Height = 454 
$listView1.Size = $System_Drawing_Size
$listView1.TabIndex = 0
$listView1.UseCompatibleStateImageBehavior = false
$listView1.View = System.Windows.Forms.View.Details

$form1.Controls.Add($listView1)
$ListView1.ColumnHeader.Add("Colonne 1",100)
$ListView1.ColumnHeader.Add("Colonne 2",100)

$listView1.View = System.Windows.Forms.View.Details

Help me please.
Thank you in advance.