Sometimes, when you build a multi-tenant web-application you may need to set up a "master password" to your system - the password which allows some administrator to login to any user's account. Something similar to `su` command in Unix/Linux systems...

This task usually appears when you need to transfer your old MVC web application to ASP.NET Core. If you use MVC version 3 or 4 and your application provides a user authentication service, then most likely this part is done with the old ASP.NET Membership library...

Since we need to register a user for testing purposes first of all - we don't want to make the password too complicated. We'd prefer to keep it simple and easy-to-remember (in the end - it's not a production-mode system!)...

With this post, we start a series of articles that describe the different aspects of using ASP.NET Identity in your ASP.NET (Core) applications...