This is a custom modal login using asp.net mvc/C#/Boostrap and sql server.
These are the steps:
A - BACK-END (SQL SERVER 2012)
1 - CREATE USER TABLE
2 - CREATE LOGIN STORED PROCEDURE
B - FRONT-END ASP.NET MVC/C#
1 - CREATE CLASS LIBRARY
2 - CREATE THE USER CONTROLLER
3 - CREATE THE VIEW (MODAL LOGIN)