protected void Page_Load(object sender, EventArgs e) { OAuth2Facebook.Callback( Request.Params["code"], Request.Params["error"], Request.Params["state"], Request.Params["error_description"], Request.Params["error_uri"], success: state => { OAuth2Facebook.SuccessCallback(state); LoginHelper.LoginUser( state.ProviderName + "-" + state.PersonId, state.PersonName, state.PersonEmail, state.PersonPhotoUrl, "User"); HttpContext.Current.Response.Redirect(state.ReturnUrl); }, failure: state => HttpContext.Current.Response.Redirect(state.ReturnUrl)); }