Prevent show previous pages after logout in asp.net

protected void logout_OnClick(object sender, EventArgs e)
{
Session.Abandon();
Response.Redirect("login.aspx");
}

on master page -

protected void Page_Init(object sender, EventArgs e
{
Response.Cache.SetExpires(DateTime.UtcNow.AddMinutes(-1));
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.Cache.SetNoStore();
}