asp.net - Need advice on adding items to Shopping Cart -

I'm going to implement the original shopping cart. I've already done this already, but looking for a better way.

In fact, the way I first set up the table, it was like this:

MyCart table:

  UserId ProductID Quantity TotalPrice 06 PID08 1 499.00 06 PID06 2 200.00 06 PID04 1 499.00 06 PID01 1 499.00 06 PID09 1 499.00 02 PID25 1 499.00   
 As you can see, there are only 2 customers in their cart Items are added  06's  There are five items in the shopping cart and items in the shopping cart  02 .  
 I'm thinking that it would be better to insert an array, instead of just adding and adding and adding, but what about a list? Can you add a list to the DB table? How do  you  add items to a "cart"?   
 
 
 This is almost exactly how I will implement it, except that I have GUIDs as keys Appears to be used.  
 However, you should not store the price in that table; It can be easily calculated by multiplying the price of the product on the basis of quantity. 
 If you allow custom-per-user pricing, then it may be meaningful to save the price here, though this information will still be better for furthering that value   < / Html>