This free server .Net control provides a simple implementation of PayPal buttons. There are two buttons in the control, one is for a standard PayPal Buy Now button and the other is a PayPal Subscription button.
Once the control is referenced in your .Net web project, all you have to do is drag the button onto your web page in the same way as for other controls. Modify the properties to set the price and other details and the button is ready for use.
To use the Server Control, add a reference to the PayPalButtonCtrl.dll
This should install the control. From the Toolbox, drag the button onto your web page.