3rd time posting same question. I need the answer as codes for ASP.NET using Visual Studio and SQL server

ASP.NET - using Visual Studio and SQL server

the project is an online shopping website that provide computerized data storage facility. Users can search easily for any item. All the stock of items is updated automatically in the new system by the Administrator. The system can Maintain stock, display item information, Customer information & bill information, be able to pay online through credit cards.

FUNCTIONS:

1. admin login - admin has to provide login credentials to access the admin functions

- admin functions are: product entry, view order and view user details

2. user login/registration - user can register on the system and get his online account setup

I need help where and how to insert code to create the login screen

- functions include: adding profile information such as address and phone number, update saved information, view products in categories, add products to the cart, update cart, pay using credit card online, view order details and view items purchased