hi, i want to know the correct ways to build shopping cart. There got many method to store shopping cart item that customer press the "add to cart button". The method i know is
1. Store in session / session with array or datatable ...
This method disadvantage is when too many people visit your then the web become slow because too many session. Also session unstable like session timeout faster than setting in web.config

2. Store in cookies.
Cookies disadvantage is when the client disable cookies, then every thing cannot work. if i'm not wrong...

3. store in temporary table.
There got many articles do not recommend store in table.

This a few that i know ... so i need to know which method or other than this 3 method is the safe to implement? Thank...

You are correct about Session and Cookie not being very scalable.

The most scalable e-commerce apps persist the shopping cart to the database. You can serialize it and store it as a blob, perhaps using the Profile system. You can also store it to a custom table.

If you do this, you'd want to make good use of caching, You would search the cache for the cart whenever required, and only fetch from the database if the cache is empty. You would, of course, purge the cache when items are added or removed.

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Thank Lee Dumond. Now I try check method that suggest like store in table,blob,profile system and cache. Thank for show some way and scalable shopping cart in database.