What would the best way to make a shopping cart in .Net 4 VB.net 2010 Be?

Yes, I am creating a Checkout screen for an application, I am using VB.net 2010 and the .NET 4 framework.  I have reviewed a bunch of different samples but I am just not sure, what would be the best way to store information on a checkout screen.  

Should I use hashtables, lists, a dictionary??  If you add the same product twice I would like it to just change the qty to 2, so it would have to support checking to see if an item already exists in the data, so the class would have to support basic information about the transaction then also a list of items that are in the cart,

Essentially what would be the best way to store all this information and some sample code to check if a product is already in the cart and to just add 1 to the qty?


Public Class Transaction
 Public Property tDate as Date
 Public Property tCustomerID as Integer
 Public Property tProducts as List(of ItemsInCart)

End Class

Public Class ItemsInCart
 Public Property productID as Integer
 Public Property itemPrice as Double
 Public Property itemQty as Integer

 Public Sub addItem(ByVal product_id as Integer)
  if product id already exists here
   modify the qty to +1
  else
   create a new line item for it
  end if
 End Sub 
End Class

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rbgCODEAsked:
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Johny BravoConnect With a Mentor Commented:
HI rbgCODE,
Please check
http://www.asp.net/web-forms/tutorials/tailspin-spyworks-part-1
You can definitely get the idea.Thanks
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dansperberCommented:
Obviously I dont know any background about your company, but, have you thought about using a shopping cart service on the internet...I have used Paypal and it is great because they keep all the data and the integration works quite well.  The reason I mention this is because you may not want the legality or other issues behind having customer information on your servers...it may be better to keep the customer data/credit cards or whatever on a site like paypal because if there ever is an issue, or hacker, let those companies deal with the lawyer issues, etc.  I have bought a lot of stuff on the internet and noticed that a lot of people use Paypal and the Paypal shopping cart...I dont know the details of how it integrates with your system, but it may be something to think about..
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rbgCODEAuthor Commented:
Credit card and payment information is not stored locally on the system, it is just a way to add up products and get a total with taxes.  So I just need a way to keep track of everything n the cart etc etc,
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rbgCODEAuthor Commented:
Anyone have any ideas?  Maybe using a class that uses dictionary to store the information?  I am open to anything...
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rbgCODEAuthor Commented:
There have been no acceptable answers can this question be closed please.
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rbgCODEAuthor Commented:
Best answer that was suggested.
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