public void Admin__Login__Kontrol(object sender, EventArgs e)
    {
        string Mauro_Admin_USER, Mauro_Admin_PWD;
        //Mauro_USER = "admin";
        //Mauro_PWD = "mauro";

        if (Page.IsValid){

            if ((UserPass.Text.Contains("mauro")))
            {
                Session["MauroLogin__Info"] = true;
                Response.Redirect("upload.aspx");


            }
            else {
                Msg.Text = "Immetta correttamente i dati per login";
            
            } 
        }
        
    }

protected void Page_Load(Object sender, EventArgs E)
    {
        if (Convert.ToBoolean(Session["MauroLogin__Info"] = false))
        {
            Response.Redirect("login.aspx");
        }
        else
        {
            Response.Redirect("pagina-protetta.aspx"); 
        }
    }

    if ((Convert.ToBoolean(Session["MauroLogin__Info"]) != true))
        {
            Response.Redirect("login.aspx");
        }