Developing A Shopping Cart In Asp.net

hi elite developers...
i am building an online boook store with cash on delivery..
for this i need to develop a shopping cart..
i am a beginner in asp.net and i want to know what are the best practices to implement shopping cart in asp.net and how to build a shopping cart in asp.net
it should provide all the functionality that are there in a normal shopping cart..
thanks in advance for your valuable replies