public static IAppBuilder UseVisualStudioAuthentication(this IAppBuilder app, VisualStudioAuthenticationOptions options) {
			if (app == null) throw new ArgumentNullException("app");
			if (options == null) throw new ArgumentNullException("options");

			app.Use(typeof(VisualStudioAuthenticationMiddleware), app, options);

			return app;
		}
        public static IAppBuilder UseVisualStudioAuthentication(this IAppBuilder app, VisualStudioAuthenticationOptions options)
        {
            if (app == null)
            {
                throw new ArgumentNullException(nameof(app));
            }
            if (options == null)
            {
                throw new ArgumentNullException(nameof(options));
            }

            app.Use(typeof(VisualStudioAuthenticationMiddleware), app, options);

            return(app);
        }