Navigational Workflows Unleashed in WWF/ASP.NET 3.5

using System;

namespace DateSite
{
    /// <summary>
    /// Page for entering personal appearance information.
    /// </summary>
    public partial class appearance : System.Web.UI.Page
    {
        private WorkflowManager _workflowManager;
        private Profile _profile;

        /// <summary>
        /// Page initialization code.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void Page_Init(object sender, EventArgs e)
        {
            // create an instance of the navigational workflow manager
            _workflowManager = new WorkflowManager(Application, Session, Request, Response);

            // make sure the workflow is synchronized... meaning the page we are on is the page we should be on / can be on
            _workflowManager.SynchronizeWorkflow();

            // get the dating id from session
            string datingId = Session["datingId"] as string;

            // retrieve the given user's profile
            _profile = Database.SelectProfile(datingId);

            // populate the data on the page
            LoadData();
        }

        /// <summary>
        /// Navigate to the previous page in the navigational workflow.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void btnPrevious_Click(object sender, EventArgs e)
        {
            // navigate to the previous page
            string pageToGoTo = _workflowManager.Previous();
            _workflowManager.ManagedRedirect(pageToGoTo);
        }

        /// <summary>
        /// Navigate to the next page in the navigational workflow.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void btnNext_Click(object sender, EventArgs e)
        {
            // save data to database
            SaveData();

            // navigate to the next page
            string pageToGoTo = _workflowManager.Next();
            _workflowManager.ManagedRedirect(pageToGoTo);
        }

        /// <summary>
        /// Load appearance information from the database.
        /// </summary>
        private void LoadData()
        {
            if (_profile.EyeColor != null)
                ddlEyeColor.SelectedValue = _profile.EyeColor;

            if (_profile.HairColor != null)
                ddlHairColor.SelectedValue = _profile.HairColor;

            if (_profile.BestFeature != null)
                ddlBestFeature.SelectedValue = _profile.BestFeature;
        }

        /// <summary>
        /// Save the appearance information to the database.
        /// </summary>
        private void SaveData()
        {
            _profile.EyeColor = ddlEyeColor.SelectedValue;
            _profile.HairColor = ddlHairColor.SelectedValue;
            _profile.BestFeature = ddlBestFeature.SelectedValue;

            Database.UpdateProfile(_profile);
        }
    }
}