sending data to paypal

Try the following link. It would be helpful for you to do this sure

http://www.codersbarn.com/post/2008/03/27/Integrate-PayPal-Checkout-Button-with-ASPNET-20.aspx

With regards
Lincy Lucy
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If you dont like learning the whole PayPal API and write lots of codes and fight with hundreds of errors, you can use the control "ASP.NET PayPal Control for Website Payments Standard" from SpiceLogic. This control is a complete server control comes with rich design time wizard and customizable API. It is good for Not only sending the checkout information to PayPal, but also this control fires IPN_Notified and PayPal Returned event whenever PayPal receives payment and notify your website for IPN. The control will capture this event and fire the IPN_Notified event where the event argument object holds all the IPN data in strongly typed objects. You can generate the Encrypted Website Payment buttons on the fly just by clicking a checkbox in design time of this control. Once you get the control, you can drag and drop a BuyNow button from the toolbar to your ASPX page, set some properties and you are ready to earn money. It is that simple. Here is the link:

http://www.spicelogic.com/Products/ASP-NET-PayPal-Control-for-Website-Payments-Standard-4