public ViewResult ClientCredentialsGrant(ClientCredentialsGrantViewModel model)
        {
            if (this.ModelState.IsValid)
            {
                try
                {
                    // Create the client with which we will be connecting to the server.
                    var webServerClient = new WebServerClient(this.AuthorizationServerDescription, clientIdentifier: model.ClientId, clientSecret: model.ClientSecret);

                    // The scope that we request for the client. Note: this can also be null if we don't want to request any specific
                    // scope or more than one scope if we want to request an access token that is valid for several scopes
                    var clientScopes = OAuthUtilities.SplitScopes(model.Scope ?? string.Empty);

                    // Request a new client access token for the specified scopes (http://tools.ietf.org/html/draft-ietf-oauth-v2-31#section-4.4)
                    // This method will use the client identifier and client secret used when constructing the WebServerAgentClient instance
                    this.ViewBag.AccessToken = webServerClient.GetClientAccessToken(clientScopes);
                }
                catch (Exception ex)
                {
                    this.ViewBag.Exception = ex;
                }
            }

            return this.View(model);
        }
        public ViewResult ClientCredentialsGrant()
        {
            // We will set-up correct default values to make it easier for the user to start testing
            var model = new ClientCredentialsGrantViewModel { ClientId = "demo-client-identifier", ClientSecret = "demo-client-secret", Scope = "demo-client-scope" };

            return this.View(model);
        }