protected void Page_Load(object sender, EventArgs e) { var queryArgs = Request.QueryString; if (queryArgs.Count > 0) { string[] keys = queryArgs.AllKeys; if (keys.Contains("code") && keys.Contains("state")) { string code = queryArgs.GetValues("code")[0]; string state = queryArgs.GetValues("state")[0]; if (state != Session["State"].ToString()) { Session.Remove("State"); Response.Redirect("/Login.aspx"); } else { var token = OAuthHelper.GetOAuthTokenByCode(code, System.Web.Configuration.WebConfigurationManager.AppSettings["RedirectUrl"]); Session["Token"] = token; Session.Remove("State"); Response.Redirect("/Home.aspx"); } } } Response.Redirect("/Home.aspx"); }