What's SaaS development? What are the multi-tenancy pros and challenges? Different multi-tenant deployment and database architectures. How to identify the active tenant, how to isolate the data in the same database, how to set TenantId automatically for new entities, how to select DB connection for the active tenant, how to change the active tenant when needed, how to disable multi-tenancy temporarily, how to handle database migrations and lastly feature system. These features are major multi-tenancy features and you'll learn how these features are implemented in an open-source web app framework.