You are implementing an ASP.NET page in an e-commerce application. Code in a btnAddToCart_Click
event handler adds a product to the shopping cart. The page should check the status of the shopping
cart and always show a cart icon when one or more items are in the shopping cart. The page should
hide the icon when the shopping cart has no items. You need to add an event handler to implement
this requirement. Which event handler should you add?

A.
btnAddToCart_Click

B.
Page_Load

C.
Page_PreRender

D.
Page_PreInit