Navigational Workflows Unleashed in WWF/ASP.NET 3.5

using System;
using System.Workflow.Runtime;
using System.Workflow.Activities;

namespace DateSite
{
    public class Global : System.Web.HttpApplication
    {
        /// <summary>
        /// This method fires when the application is first started and is responsible for
        /// setting up the workflow runtime to be hosted by the asp.net application. It creates
        /// the workflow runtime with the given settings from the web.config. It then proceeds
        /// to add the local services defined in the web.config. Finally it starts the workflow
        /// runtime and stores the instance in an application variable. Only one instance of the
        /// workflow runtime can be running in a single application domain.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void Application_Start(object sender, EventArgs e)
        {
            // create an instance of workflow runtime, loading settings from web.config
            WorkflowRuntime workflowRuntime = new WorkflowRuntime(WorkflowManager.WorkflowRuntimeKey);

            // add the external data exchange service to the runtime to allow for local services
            ExternalDataExchangeService exchangeService = new ExternalDataExchangeService(WorkflowManager.LocalServicesKey);
            workflowRuntime.AddService(exchangeService);

            // start the workflow runtime
            workflowRuntime.StartRuntime();

            // save the runtime for use by the entire application
            Application[WorkflowManager.WorkflowRuntimeKey] = workflowRuntime;
        }

        /// <summary>
        /// This method fires when the application stops. It stops the workflow runtime and 
        /// disposes of the resources it was using.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void Application_End(object sender, EventArgs e)
        {
            // obtain reference to workflow runtime
            WorkflowRuntime workflowRuntime = Application[WorkflowManager.WorkflowRuntimeKey] as WorkflowRuntime;

            // stop the runtime
            if (workflowRuntime != null)
            {
                workflowRuntime.StopRuntime();
                workflowRuntime.Dispose();
            }
        }
    }
}