VB.net - problem getting the ListIndex of ListView without clicking

Hi
I am trying to get the ListIndex of a ListVew without clicking it but the last two lines of the following code
cause errors.

 Sub Get_Row_Index_on_Mousehover()
        Dim LocalMousePosition As Point
        LocalMousePosition = Me.lsvAction.PointToClient(Cursor.Position)
        Debug.WriteLine("X = " & LocalMousePosition.X & ", " & LocalMousePosition.Y)

        Dim x As Integer = LocalMousePosition.X
        Dim y As Integer = LocalMousePosition.Y
        Dim returnValue As ListViewItem
        returnValue = Me.lsvAction.GetItemAt(x, y)

        MsgBox(returnValue.Index)
 
    End Sub