In this tutorial, we're diving deep into implementing a complete authentication system for a cross-platform Blazor application. This isn't just a basic login form - we're building a robust, real-world authentication solution that works across Blazor WebAssembly and .NET MAUI with Radzen UI components. Key Features We'll Implement Authentication Pages: Professional login page with email validation and "remember me" functionality Comprehensive registration form with password strength requirements and terms acceptance Forgot password flow for account recovery Clean, modern UI using Radzen Blazor components Security Components: AuthStateProvider component for protecting routes and managing authentication state UserProfileMenu component with role-based menu items Seamless navigation handling for authenticated and unauthenticated users Architecture Highlights: Dual-mode authentication service that works with both BFF (Backend for Frontend) pattern for web and direct API calls for MAUI Proper separation of concerns between shared UI components and platform-specific configurations Token management and secure storage strategies Real-time authentication state changes across components Radzen Integration: RadzenTemplateForm for elegant form handling Built-in validators including Required, Email, Length, Regex, and Compare validators RadzenNotificationService for user feedback RadzenDialogService for confirmation prompts Responsive layout using RadzenStack, RadzenRow, and RadzenColumn What Makes This Special This implementation demonstrates professional-grade practices including: Password complexity requirements with visual feedback Loading states and busy indicators during async operations Proper error handling and user notifications Return URL handling after authentication Role-based UI rendering Mobile-first responsive design Tech Stack Blazor WebAssembly and .NET MAUI for cross-platform development MongoDB for flexible data storage Radzen Blazor components for enterprise-grade UI ASP.NET Core Web API backend JWT token-based authentication Perfect For This tutorial is ideal for C# developers who want to learn how to build secure, multi-platform applications with modern authentication patterns. Whether you're building internal business applications or customer-facing products, these patterns will serve you well. Source Code All source code for this project is available on GitHub. You can clone the complete repository and follow along with the tutorial at: GitHub - benjaminsqlserver/SoccerLeagueAppWithMongoDB The repository includes everything you need to get started, including the backend API and shared Blazor components. Don't forget to like, subscribe, and hit the notification bell to stay updated with the latest tutorials. Drop your questions in the comments below, and I'll be happy to help! Happy coding, and let's build something amazing together!