Let's now implement the "Add New Product" form post functionality of our site.  We'll ultimately want users to see a screen like below when they visit the /Products/New URL:

Figure 13

Form input and editing scenarios are typically handled in the ASP.NET MVC Framework by exposing two Action methods on a Controller class.  The first Controller Action method is responsible for sending down the HTML containing the initial form to display.  The second Controller action method is then responsible for handling any form submissions sent back from the browser.

For example, for our "Add Product" screen above we could choose to implement it across two different ProductsController actions: one called "New" and one called "Create".  The /Products/New URL would be responsible for displaying an empty form with HTML textboxes and drop-down list controls to enter new product details.  The HTML <form> element on this page would then have its "action" attribute set to the /Products/Create URL.  This means that when the user presses a form submit button on it, the form inputs will be sent to the "Create" action to process and update the database with.

Figure 14