Enable double click event on a ListBox in a vb.net web application

There's a nice concise C# example of supporting double click event on a listbox control in an asp.net web application, here is the equivalent code (for the page load event) in Visual Basic.

If (Not Request.Item("__EVENTARGUMENT") Is Nothing And Request.Item("__EVENTARGUMENT") = "move") Then

Dim idx As Integer = ListBox1.SelectedIndex
Dim item As ListItem = ListBox1.SelectedItem
ListBox1.Items.Remove(item)
ListBox2.SelectedIndex = -1
ListBox2.Items.Add(item)

End If

ListBox1.Attributes.Add("ondblclick", ClientScript.GetPostBackEventReference(ListBox1, "move"))