A full stack web application regarding a sail club developed by ASP.NET Core MVC (C#). It almost covered all features that you can think about for a database application. Please use the sail.sql to set up your database in MS SQL first. It includes the following features: CRUD, relationship between tables, validation rules for input based on business logics, a vareity of input forms, role-based authorization, role management (delete users, delete roles, lock out user accounts suspen user account), exception handler;