How to Disable back button after signout/logout

write the below line(For C#) at the page/pages where u r after sign in and accessing them

On Page load event :

Response.CacheControl = "no-cache";

if (Session["SessionName"] == null)

{

Response.Redirect("Yourpage.aspx");

}

and it's done when u r go to the your redirected page & press back button of browser it will remain in the same page.

Good luck.