VBで書いてみました。

<%@ PAGE LANGUAGE="VB" AutoEventWireup="false" Inherits="Test" Src="sample.aspx.vb" %>
<html>
<body>
  <asp:Label id="l1" runat="server" />
  <br>
  <asp:Label id="l2" runat="server" />
</body>
</html>

imports System
imports System.Web.UI
imports System.Web.UI.WebControls

public class Test
  Inherits Page

  protected l1 As Label
  protected l2 As Label

  private Sub Page_Init(sender As object, e As EventArgs) Handles MyBase.Init
    l1.Text = "Page_Init"
  End Sub

  private Sub Page_Load(sender As object, e As EventArgs) Handles MyBase.Load
    l2.Text = "Page_Load"
  End Sub

End class