<sessionState mode="InProc" timeout="1" />

Sub Session_End(ByVal sender As Object, ByVal e As EventArgs)
    Response.Redirect("Login.aspx")
End Sub

Response is not available in this context.

Protected Sub Page_Init(sender As Object, e As EventArgs)
 If Context.Session IsNot Nothing Then
  If Session.IsNewSession Then
   Dim newSessionIdCookie As HttpCookie = Request.Cookies("ASP.NET_SessionId")
   If newSessionIdCookie IsNot Nothing Then
    Dim newSessionIdCookieValue As String = newSessionIdCookie.Value
    If newSessionIdCookieValue <> String.Empty Then
     ' This means Session was timed Out and New Session was started
     Response.Redirect("Login.aspx")
    End If
   End If
  End If
 End If
End Sub

protected void Page_Init(object sender, EventArgs e)
{
    if (Context.Session != null)
    {
        if (Session.IsNewSession)
        {
            HttpCookie newSessionIdCookie = Request.Cookies["ASP.NET_SessionId"];
            if (newSessionIdCookie != null)
            {
                string newSessionIdCookieValue = newSessionIdCookie.Value;
                if (newSessionIdCookieValue != string.Empty)
                {
                    // This means Session was timed Out and New Session was started
                    Response.Redirect("Login.aspx");
                }
            }
        }
    }
}