I was following along with one of wrox books “Beginning C# Web Applications with Visual Studio.NET” building the Friends Reunion application. I made it to chapter 3, but I keep getting an error each time I try to compile the default.aspx page. I keep getting the error:

“System.NullReferenceException: Object reference not set to an instance of an object.”

I copied the code just as illustrated in the book. Can someone help me. I’ve included the code below.

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;

using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace FriendsReunion
{
    /// <summary>
    /// Summary description for _Default.
    /// </summary>
    public class _Default : System.Web.UI.Page
    {
        protected FriendsReunion.SubHeader ccSubheader;
        protected System.Web.UI.WebControls.PlaceHolder phNav;

        private void Page_Load(object sender, System.EventArgs e)
        {
            Table tb = new Table();
            TableRow row;
            TableCell cell;
            Image img;
            HyperLink lnk;

            if (Context.User.Identity.IsAuthenticated)
            {
                // Create a new blank table row
                row = new TableRow();

                // Set up the News image
                img = new Image();
                img.ImageUrl = "Images/winbook.gif";
                img.ImageAlign = ImageAlign.Middle;
                img.Width = new Unit(24, UnitType.Pixel);
                img.Height = new Unit(24, UnitType.Pixel);

                // Create a cell and add the image
                cell = new TableCell();
                cell.Controls.Add(img);

                // Add the new cell to the row
                row.Cells.Add(cell);

                // Set up the News link
                lnk = new HyperLink();
                lnk.Text = "News";
                lnk.NavigateUrl = "News.aspx";

                // Create the cell and add the link
                cell = new TableCell();
                cell.Controls.Add(lnk);

                // Add the new cell to the row
                row.Cells.Add(cell);

                // Add the row to the table
                tb.Rows.Add(row);
            }
            else
            {
                // Code for unauthenticated users here...
            }

            // Finally, add the table to the placeholder
            phNav.Controls.Add(tb);
        }
        #region Web Form Designer generated code
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN: This call is required by the ASP.NET Web Form Designer.
            //
            InitializeComponent();
            base.OnInit(e);
        }

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion
    }
}


Bon