A Really Vain "How are my articles doing" Web Spider

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Microsoft.Win32;

namespace VainWebSpider
{
    #region frmLoader CLASS
    /// <summary>
    /// This form obtains the currently selected user from the registry
    /// (if there is a current user, if may be the 1st run, so there wont be)
    /// by using the <see cref="Program">Programs </see>readFromRegistry(..) 
    /// method. This class also allows the user to change the currently selected user
    /// via clicking a change user hyperlink. The user may also show the 
    /// <see cref="frmMain"> main interface</see> from this form using the hyperlink
    /// provided
    /// </summary>
    public partial class frmLoader : Form
    {
        #region Contructor
        /// <summary>
        /// Constructs a new frmLoader object
        /// </summary>
        public frmLoader()
        {
            InitializeComponent();
        }
        #endregion

        public frmMain frmMain
        {
            get
            {
                throw new System.NotImplementedException();
            }
            set
            {
            }
        }
        #region Private Methods
        /// <summary>
        /// Allows the user to specify a new UserId to fetch codeproject articles for by the
        /// use of a <see cref="InputBoxDialog">InputBoxDialog </see>
        /// The value entered must be a postive number
        /// </summary>
        /// <param name="sender">lnkChangeUser</param>
        /// <param name="e">LinkLabelLinkClickedEventArgs</param>
        private void lnkChangeUser_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            //get the new userId
            string stringEntered = Program.InputBox("Enter a new user ID to examine", "Enter a new user ID", "");
            //check for empty
            if (stringEntered.Equals(string.Empty)) 
            {
                Program.ErrorBox("You must enter a value for the userId");
            }
            else 
            {
                try 
                {
                    //make sure its a positive number, then update the Program
                    //held property
                    long userId = long.Parse(stringEntered);
                    if (userId > 0)
                    {
                        Program.UserID = userId;
                        lblCurrentUser.Text = "Currently set-up to fetch articles for user ID : " + Program.UserID.ToString();

                    }
                    else
                    {
                        Program.ErrorBox("User ID must be a postive value");
                    }
                }
                //its not a number that was entered, tell them off
                catch(Exception) 
                {
                    Program.ErrorBox("The value you entered was not valid\r\n" +
                                    "The user ID must be a number");
                }
            }
        }

        /// <summary>
        /// Check to see if there is already a user within the registry (from last time)
        /// to fetch codeproject articles for, by using the <see cref="Program">Programs
        ///  </see>readFromRegistry(..) method. And update this forms GUI accordingly
        /// </summary>
        /// <param name="sender">frmLoader</param>
        /// <param name="e">EventArgs</param>
        private void frmLoader_Load(object sender, EventArgs e)
        {
            //check if there is a user in the registry, if there is a user
            //update the Program class and the GUI label
            long userId = Program.readFromRegistry();
            Program.UserID = userId;
            if (userId != -1)
            {
                lblCurrentUser.Text = "Currently set-up to fetch articles for user ID : " + userId.ToString();
            }
            else
            {
                lblCurrentUser.Text = "Not setup for any user as yet, use the link to pick a new user";
            }
        }

        /// <summary>
        /// Create and show a new <see cref="frmMain">frmMain</see> object, and hide this form
        /// </summary>
        /// <param name="sender">lnkLoadMainForm</param>
        /// <param name="e">LinkLabelLinkClickedEventArgs</param>
        private void lnkLoadMainForm_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            frmMain fMain = new frmMain();
            this.Hide();
            fMain.ShowDialog(this);
        }
        #endregion
    }
    #endregion
}