Remove session

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ASP.NET

Hi,
After login from Defaul.aspx(login.aspx) page, my website goes to Default2.aspx.

In my Master page i have a Log Out Image button. When i click Log Out, i have redirected to Default4.aspx page where i have cleared session and finally redirected to Default.aspx(Login.apsx) page like below

protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["UserID"] != null)
        {
            Session.Clear();
            Response.Redirect("Default.aspx");
        }
    }

Also in Master page i have the following code at page load:

protected void Page_Load(object sender, EventArgs e)
 {
  
  if (Session["UserID"] != null)
   {
          
   }
  else
  {
    Response.Redirect("Default.aspx");
  }
}

Now when i click Back button of browser,it can goes to Defaul2.aspx.

I dont want website to redirected to Default2.aspx, after log out is clicked rather user has to enter user name and password.

How can i achieve this.

Thanks