Application AuthenticateRequest

 protected void Application_AuthenticateRequest(Object sender,EventArgs e) {
        // Extract the forms authentication cookie
        string cookieName = FormsAuthentication.FormsCookieName;
        HttpCookie authCookie = Context.Request.Cookies[cookieName];
        if(null == authCookie) {
        // There is no authentication cookie.
        return;
        }
        FormsAuthenticationTicket authTicket = null;
        try {
        authTicket = FormsAuthentication.Decrypt(authCookie.Value);
        } catch(Exception ex) {
        // Log exception details (omitted for simplicity)
        return;
        }
        if (null == authTicket) {
        // Cookie failed to decrypt.
        return;
        }
        // When the ticket was created, the UserData property wasassigned
        // a pipe delimited string of role names.
            // Create an Identity object
        FormsIdentity id = new FormsIdentity( authTicket );
        string[] Roles =new string[2];
        Roles[0]="User";
        // This principal will flow throughout the request.
        System.Security.Principal.GenericPrincipal principal = new System.Security.Principal.GenericPrincipal(id,Roles);
        // Attach the new principal object to the current HttpContextobject
         System.Web.HttpContext.Current.User = principal;
}