custom user login with ASP.NET using SQL and C#

custom user login with ASP.NET using SQL and C#

Hello!
I've been working on a ASP.NET application and i've managed to create a
Login and register webpage linked to a SQL Database using C# as
server-side code.

Problem:
I couldn't find a good method to keep a user logged in while opening
different pages, What is the best method to do this but then 100%
customizeable, preferably tot using "Logincontrols".

Thanks for your time!
-JV