Listens for form submission events in Formulate.

AppStart_SetEmailByPage.cs

/// <summary>
/// Handles application startup.
/// </summary>
public class AppStart : ApplicationEventHandler
{
	protected override void ApplicationStarting(UmbracoApplicationBase umbracoApplication,
		ApplicationContext applicationContext)
	{

		// Initialize Formulate events.
		formulate.api.Submissions.Submitting += SetEmailByPage;

		// Boilerplate.
		base.ApplicationStarting(umbracoApplication, applicationContext);

	}
}