want to write a code for a cart on buy now button in asp.net c#

See more:

SQL-Server-2005

C#

ASP.NET

, +

hello guyx i am makin a e-cart web aplikation for my final year projct the problem is that

i want a code that when user clik on a buy now button below the item he wants to buy. automatically the item add to the cart .. and on the top of page the line like

you have (0) items in your cart

change into

you have (1) items in your cart

and as many times buyer clik on the button the number of items in cart get increase.. and then at chk out page al the items show in row with there rates and then buyer clik at chk out .. web page directed to paypal .. with the total amount billed

..... giv me some suggestions and tips how can i do this usin c#
and is strong knowledge is neccessary if i want to write such a code ??

help guys .. m biginer :|