Gmail Agent API v0.5 / Mail Notifier & Address Importer

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Text;
using System.IO;
using System.Threading;
using Microsoft.Win32;
using Johnvey.GmailAgent;
using JCMLib;

namespace Johnvey.GmailAgent.Applet
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class BaseWindow : System.Windows.Forms.Form
	{
	
		protected BaseWindow self;

		public GmailAdapter gmail;
		public GmailSessionCollection accounts;
		
		// refresh interval in minutes
		private int refreshInterval;
		private DateTime lastRefresh = new DateTime(0);
		private Hashtable lastTimestamp = new Hashtable();
		private Hashtable latestMessage = new Hashtable();

		private System.Windows.Forms.ListView sessionList;
		private System.Windows.Forms.GroupBox accountStatus;
		private System.Windows.Forms.Label newThreadsLabel;
		private System.Windows.Forms.ListBox newThreadsList;
		private System.Windows.Forms.Label threadPreviewLabel;
		private System.Windows.Forms.ContextMenu notifyIconContextMenu;
		private JCMLib.NotifyIconEx notifyIcon;
		private System.Windows.Forms.Button closeButton;
		private System.Windows.Forms.ImageList imageList;
		private System.Windows.Forms.Button gmailButton;
		private System.Windows.Forms.TextBox threadPreviewText;
		private System.Windows.Forms.Button refreshButton;
		private System.Timers.Timer refreshTimer;
		private System.Windows.Forms.TextBox refreshIntervalBox;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.GroupBox groupBox1;
		private System.Windows.Forms.Label label3;
		private System.Windows.Forms.TextBox lastCheckedText;
		private System.ComponentModel.IContainer components;
		
		#region Default form code


		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}
		#endregion

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.components = new System.ComponentModel.Container();
			System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(BaseWindow));
			this.sessionList = new System.Windows.Forms.ListView();
			this.imageList = new System.Windows.Forms.ImageList(this.components);
			this.accountStatus = new System.Windows.Forms.GroupBox();
			this.lastCheckedText = new System.Windows.Forms.TextBox();
			this.label3 = new System.Windows.Forms.Label();
			this.threadPreviewText = new System.Windows.Forms.TextBox();
			this.newThreadsList = new System.Windows.Forms.ListBox();
			this.threadPreviewLabel = new System.Windows.Forms.Label();
			this.newThreadsLabel = new System.Windows.Forms.Label();
			this.notifyIconContextMenu = new System.Windows.Forms.ContextMenu();
			this.notifyIcon = new JCMLib.NotifyIconEx();
			this.closeButton = new System.Windows.Forms.Button();
			this.gmailButton = new System.Windows.Forms.Button();
			this.refreshButton = new System.Windows.Forms.Button();
			this.refreshTimer = new System.Timers.Timer();
			this.refreshIntervalBox = new System.Windows.Forms.TextBox();
			this.label1 = new System.Windows.Forms.Label();
			this.label2 = new System.Windows.Forms.Label();
			this.groupBox1 = new System.Windows.Forms.GroupBox();
			this.accountStatus.SuspendLayout();
			((System.ComponentModel.ISupportInitialize)(this.refreshTimer)).BeginInit();
			this.SuspendLayout();
			// 
			// sessionList
			// 
			this.sessionList.Activation = System.Windows.Forms.ItemActivation.OneClick;
			this.sessionList.HeaderStyle = System.Windows.Forms.ColumnHeaderStyle.None;
			this.sessionList.HideSelection = false;
			this.sessionList.LargeImageList = this.imageList;
			this.sessionList.Location = new System.Drawing.Point(8, 8);
			this.sessionList.MultiSelect = false;
			this.sessionList.Name = "sessionList";
			this.sessionList.Size = new System.Drawing.Size(104, 368);
			this.sessionList.SmallImageList = this.imageList;
			this.sessionList.TabIndex = 0;
			this.sessionList.Click += new System.EventHandler(this.sessionList_onItemClick);
			// 
			// imageList
			// 
			this.imageList.ImageSize = new System.Drawing.Size(32, 32);
			this.imageList.ImageStream = ((System.Windows.Forms.ImageListStreamer)(resources.GetObject("imageList.ImageStream")));
			this.imageList.TransparentColor = System.Drawing.Color.Transparent;
			// 
			// accountStatus
			// 
			this.accountStatus.Controls.Add(this.lastCheckedText);
			this.accountStatus.Controls.Add(this.label3);
			this.accountStatus.Controls.Add(this.threadPreviewText);
			this.accountStatus.Controls.Add(this.newThreadsList);
			this.accountStatus.Controls.Add(this.threadPreviewLabel);
			this.accountStatus.Controls.Add(this.newThreadsLabel);
			this.accountStatus.Location = new System.Drawing.Point(128, 8);
			this.accountStatus.Name = "accountStatus";
			this.accountStatus.Size = new System.Drawing.Size(272, 368);
			this.accountStatus.TabIndex = 1;
			this.accountStatus.TabStop = false;
			this.accountStatus.Text = "Current Status";
			// 
			// lastCheckedText
			// 
			this.lastCheckedText.BackColor = System.Drawing.SystemColors.Control;
			this.lastCheckedText.BorderStyle = System.Windows.Forms.BorderStyle.None;
			this.lastCheckedText.Location = new System.Drawing.Point(96, 32);
			this.lastCheckedText.Name = "lastCheckedText";
			this.lastCheckedText.Size = new System.Drawing.Size(160, 13);
			this.lastCheckedText.TabIndex = 6;
			this.lastCheckedText.Text = "Never";
			// 
			// label3
			// 
			this.label3.Location = new System.Drawing.Point(16, 32);
			this.label3.Name = "label3";
			this.label3.Size = new System.Drawing.Size(88, 16);
			this.label3.TabIndex = 5;
			this.label3.Text = "Last Checked:";
			// 
			// threadPreviewText
			// 
			this.threadPreviewText.BackColor = System.Drawing.Color.White;
			this.threadPreviewText.Location = new System.Drawing.Point(16, 208);
			this.threadPreviewText.Multiline = true;
			this.threadPreviewText.Name = "threadPreviewText";
			this.threadPreviewText.ReadOnly = true;
			this.threadPreviewText.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
			this.threadPreviewText.Size = new System.Drawing.Size(240, 144);
			this.threadPreviewText.TabIndex = 4;
			this.threadPreviewText.Text = "";
			// 
			// newThreadsList
			// 
			this.newThreadsList.Location = new System.Drawing.Point(16, 72);
			this.newThreadsList.Name = "newThreadsList";
			this.newThreadsList.ScrollAlwaysVisible = true;
			this.newThreadsList.SelectionMode = System.Windows.Forms.SelectionMode.None;
			this.newThreadsList.Size = new System.Drawing.Size(240, 108);
			this.newThreadsList.TabIndex = 0;
			// 
			// threadPreviewLabel
			// 
			this.threadPreviewLabel.Location = new System.Drawing.Point(16, 192);
			this.threadPreviewLabel.Name = "threadPreviewLabel";
			this.threadPreviewLabel.Size = new System.Drawing.Size(168, 23);
			this.threadPreviewLabel.TabIndex = 3;
			this.threadPreviewLabel.Text = "New Thread Previews";
			// 
			// newThreadsLabel
			// 
			this.newThreadsLabel.Location = new System.Drawing.Point(16, 56);
			this.newThreadsLabel.Name = "newThreadsLabel";
			this.newThreadsLabel.Size = new System.Drawing.Size(152, 16);
			this.newThreadsLabel.TabIndex = 2;
			this.newThreadsLabel.Text = "New Thread Counts";
			// 
			// notifyIcon
			// 
			this.notifyIcon.ContextMenu = this.notifyIconContextMenu;
			this.notifyIcon.Icon = ((System.Drawing.Icon)(resources.GetObject("notifyIcon.Icon")));
			this.notifyIcon.Text = "Gmail Agent";
			this.notifyIcon.Visible = true;
			// 
			// closeButton
			// 
			this.closeButton.FlatStyle = System.Windows.Forms.FlatStyle.System;
			this.closeButton.Location = new System.Drawing.Point(320, 440);
			this.closeButton.Name = "closeButton";
			this.closeButton.TabIndex = 2;
			this.closeButton.Text = "Close";
			this.closeButton.Click += new System.EventHandler(this.close_onClick);
			// 
			// gmailButton
			// 
			this.gmailButton.FlatStyle = System.Windows.Forms.FlatStyle.System;
			this.gmailButton.Location = new System.Drawing.Point(208, 440);
			this.gmailButton.Name = "gmailButton";
			this.gmailButton.Size = new System.Drawing.Size(104, 23);
			this.gmailButton.TabIndex = 3;
			this.gmailButton.Text = "Open Gmail";
			this.gmailButton.Click += new System.EventHandler(this.launchGmail_onClick);
			// 
			// refreshButton
			// 
			this.refreshButton.FlatStyle = System.Windows.Forms.FlatStyle.System;
			this.refreshButton.Location = new System.Drawing.Point(8, 440);
			this.refreshButton.Name = "refreshButton";
			this.refreshButton.TabIndex = 4;
			this.refreshButton.Text = "Refresh";
			this.refreshButton.Click += new System.EventHandler(this.refresh_onClick);
			// 
			// refreshTimer
			// 
			this.refreshTimer.Enabled = true;
			this.refreshTimer.SynchronizingObject = this;
			// 
			// refreshIntervalBox
			// 
			this.refreshIntervalBox.Location = new System.Drawing.Point(186, 397);
			this.refreshIntervalBox.MaxLength = 2;
			this.refreshIntervalBox.Name = "refreshIntervalBox";
			this.refreshIntervalBox.Size = new System.Drawing.Size(24, 20);
			this.refreshIntervalBox.TabIndex = 5;
			this.refreshIntervalBox.Text = "";
			this.refreshIntervalBox.TextAlign = System.Windows.Forms.HorizontalAlignment.Right;
			this.refreshIntervalBox.Leave += new System.EventHandler(this.refresh_onLeave);
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(24, 400);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(168, 16);
			this.label1.TabIndex = 6;
			this.label1.Text = "Check for new messages every";
			// 
			// label2
			// 
			this.label2.Location = new System.Drawing.Point(213, 400);
			this.label2.Name = "label2";
			this.label2.Size = new System.Drawing.Size(51, 16);
			this.label2.TabIndex = 7;
			this.label2.Text = "minutes.";
			// 
			// groupBox1
			// 
			this.groupBox1.Location = new System.Drawing.Point(8, 384);
			this.groupBox1.Name = "groupBox1";
			this.groupBox1.Size = new System.Drawing.Size(392, 40);
			this.groupBox1.TabIndex = 8;
			this.groupBox1.TabStop = false;
			// 
			// BaseWindow
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(410, 483);
			this.ControlBox = false;
			this.Controls.Add(this.refreshIntervalBox);
			this.Controls.Add(this.label2);
			this.Controls.Add(this.label1);
			this.Controls.Add(this.refreshButton);
			this.Controls.Add(this.gmailButton);
			this.Controls.Add(this.closeButton);
			this.Controls.Add(this.accountStatus);
			this.Controls.Add(this.sessionList);
			this.Controls.Add(this.groupBox1);
			this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWindow;
			this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
			this.MaximizeBox = false;
			this.Name = "BaseWindow";
			this.ShowInTaskbar = false;
			this.SizeGripStyle = System.Windows.Forms.SizeGripStyle.Hide;
			this.Text = "Gmail Agent 0.5";
			this.WindowState = System.Windows.Forms.FormWindowState.Minimized;
			this.accountStatus.ResumeLayout(false);
			((System.ComponentModel.ISupportInitialize)(this.refreshTimer)).EndInit();
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new BaseWindow());
		}


		/// <summary>
		/// Main form logic.
		/// </summary>
		public BaseWindow() {
			
			// Required for Windows Form Designer support
			InitializeComponent();


			// Create the system tray icon
			notifyIcon.Click += new EventHandler(notifyIcon_onClick);
			notifyIcon.BalloonClick += new EventHandler(notifyIcon_onBalloonClick);

			// Create the system tray context menu
			notifyIconContextMenu.MenuItems.Add(new MenuItem("Contacts...", new EventHandler(menuContacts_onClick)));
			notifyIconContextMenu.MenuItems.Add("-");
			notifyIconContextMenu.MenuItems.Add(new MenuItem("Accounts...", new EventHandler(menuAccounts_onClick)));
			notifyIconContextMenu.MenuItems.Add(new MenuItem("Status...", new EventHandler(menuProperties_onClick)));
			notifyIconContextMenu.MenuItems.Add("-");
			notifyIconContextMenu.MenuItems.Add(new MenuItem("About", new EventHandler(menuAbout_onClick)));
			notifyIconContextMenu.MenuItems.Add(new MenuItem("Exit", new EventHandler(menuExit_onClick)));

			// instantiate the Gmail components
			this.gmail = new GmailAdapter();
			this.accounts = new GmailSessionCollection();

			// refresh login info
			RefreshLoginInfo();

			// contact refresh delegate to get info from Gmail
			RefreshAllSessionsDelegate refresher = new RefreshAllSessionsDelegate(this.RefreshAllSessions);
			IAsyncResult ar = refresher.BeginInvoke(new AsyncCallback(RefreshAllCallback), refresher);
			this.lastRefresh = DateTime.Now;

			// repeat the refresh as per user settings
			refreshTimer.Interval = 5000;
			refreshTimer.AutoReset = true;
			refreshTimer.Elapsed += new System.Timers.ElapsedEventHandler(refreshTimer_onElapsed);

			// hide the window
			this.Hide();
		}


		/// <summary>
		/// Reads stored login information in registry and initializes session objects
		/// </summary>
		public void RefreshLoginInfo() {
			// reset account info
			this.accounts.Clear();
			this.sessionList.Items.Clear();

			// get the account logins
			RegistryKey workingRegistry = Application.UserAppDataRegistry;
			RegistryKey accountsKey = workingRegistry.CreateSubKey("Accounts");

			// read refresh interval (or set to default)
			if(workingRegistry.GetValue("RefreshInterval") != null) {
				this.refreshInterval = (int)workingRegistry.GetValue("RefreshInterval");
			} else {
				workingRegistry.SetValue("RefreshInterval", 2);
				this.refreshInterval = 2;
			}
			this.refreshIntervalBox.Text = this.refreshInterval.ToString();

			// read the stored accounts and initialize
			foreach(string accountName in accountsKey.GetValueNames()) {
				GmailSession tmpSession = new GmailSession();
				tmpSession.Username = accountName;
				tmpSession.Password = SimpleEncryption.Decrypt(accountsKey.GetValue(accountName).ToString(), "GmailAgent0500");
				tmpSession.NewMessageEventHandler += new GmailSession.EventHandler(NotifyNewMessages);
				this.accounts.Add(tmpSession);
				this.sessionList.Items.Add(new ListViewItem(tmpSession.Username, 0));
			}

		}

		/// <summary>
		/// Requests a mailbox update for all currently active GmailSessions in 'accounts'
		/// </summary>
		protected void RefreshAllSessions() {

			bool accountsHaveNewMessages = false;

			foreach(GmailSession session in this.accounts) {

				// refresh mailbox info
				GmailAdapter.RequestResponseType loginResult = gmail.Refresh(session);

				if(loginResult == GmailAdapter.RequestResponseType.LoginFailed) {
					notifyIcon.ShowBalloon("Gmail login failed!", "The login information for " + session.Username + " is incorrect. Verify your account information in the Accounts page.", NotifyIconEx.NotifyInfoFlags.Error, 10000);
					break;
				}
				if(loginResult == GmailAdapter.RequestResponseType.RefreshFailed) {
					notifyIcon.ShowBalloon("Gmail refresh failed!", "GmailAgent was unable to refresh the mailbox information for " + session.Username + ".", NotifyIconEx.NotifyInfoFlags.Warning, 10000);
					break;
				}

				// save the timestamp to determine whether new messages have appeared since last refresh
				this.lastTimestamp[session.Username] = session.ThreadListTimestamp;

				// flag new messages from any account
				if((int)session.DefaultSearchCounts["Inbox"] > 0) {
					this.latestMessage[session.Username] = ((GmailThread)session.UnreadThreads[0]).ThreadID;
					accountsHaveNewMessages = true;
				}

			}
			this.lastRefresh = DateTime.Now;


			if(!accountsHaveNewMessages) {
				// change the icon
				try {
					Stream iconStream = this.GetType().Assembly.GetManifestResourceStream("Johnvey.GmailAgent.Applet.gmail.ico"); 
					Icon newIcon = new Icon(iconStream);
					notifyIcon.Icon = newIcon;
					iconStream.Close();
				} catch(Exception ex) {
					MessageBox.Show(ex.Message);
				}

				notifyIcon.Text = "Gmail Agent";
			}
		}

		/// <summary>
		/// Generates traditional and balloon tooltips for a new message event.
		/// </summary>
		/// <param name="sender"></param>
		protected void NotifyNewMessages(object sender) {

			GmailSession currentSession = (GmailSession)sender;
			
			GmailThread newestThread = (GmailThread)currentSession.UnreadThreads[0];

			if(newestThread.ThreadID != (string)this.latestMessage[currentSession.Username]) {

				string threadSummary = Utilities.CleanHtml(newestThread.AuthorsHtml)
					+ " - " + Utilities.CleanHtml(newestThread.DateHtml)
					+ "\n" + Utilities.CleanHtml(newestThread.SubjectHtml)
					+ "\n\n" + Utilities.CleanHtml(newestThread.SnippetHtml);
				if(newestThread.IsStarred) threadSummary = "*" + threadSummary;

				string title = currentSession.Username + " - "
					+ currentSession.DefaultSearchCounts["Inbox"].ToString()
					+ ((int)currentSession.DefaultSearchCounts["Inbox"] == 1 ? " unread Gmail thread" : " unread Gmail threads");

				notifyIcon.ShowBalloon(title, threadSummary, NotifyIconEx.NotifyInfoFlags.Info, 10000);

				// change the icon
				try {
					Stream iconStream = this.GetType().Assembly.GetManifestResourceStream("Johnvey.GmailAgent.Applet.gmail-new.ico"); 
					Icon newIcon = new Icon(iconStream);
					notifyIcon.Icon = newIcon;
					iconStream.Close();
				} catch(Exception ex) {
					MessageBox.Show(ex.Message);
				}

				// update the tooltip text
				this.notifyIcon.Text = title;
			}
		}


		#region Delegate declarations

		/// <summary>
		/// Delegate to refresh all current Gmail sessions.
		/// </summary>
		public delegate void RefreshAllSessionsDelegate();

		/// <summary>
		/// Callback function for RefreshAllSessionsDelegate().
		/// </summary>
		/// <param name="ar"></param>
		static void RefreshAllCallback(IAsyncResult ar) {
			// Retrieve the delegate.
			BaseWindow.RefreshAllSessionsDelegate dlgt = (BaseWindow.RefreshAllSessionsDelegate)ar.AsyncState;

			// Call EndInvoke to retrieve the results.
			dlgt.EndInvoke(ar);

		}
		#endregion


		#region UI event handlers

		// open the properties page
		private void menuProperties_onClick(object sender, System.EventArgs e) {
			this.Show();
			this.WindowState = FormWindowState.Normal;
			this.Activate();
		}

		// open the contacts page
		private void menuContacts_onClick(object sender, System.EventArgs e) {
			Contacts co = new Contacts(this);
			co.ShowDialog();
		}

		// open the accounts page
		private void menuAccounts_onClick(object sender, System.EventArgs e) {
			Accounts ac = new Accounts();
			ac.RealParentForm = this;
			ac.ShowDialog();
		}

		// open the about page
		private void menuAbout_onClick(object sender, System.EventArgs e) {
			About ab = new About();
			ab.ShowDialog();
		}

		// exit Gmail Agent
		private void menuExit_onClick(object sender, System.EventArgs e) {
			Application.Exit();
		}

		// open the status page when clicking the icon
		private void notifyIcon_onClick(object sender, EventArgs e) {
			this.Show();
			this.WindowState = FormWindowState.Normal;
			this.Activate();
		}

		// open Gmail on a balloon click
		private void notifyIcon_onBalloonClick(object sender, EventArgs e) {
			System.Diagnostics.Process.Start(GmailAdapter.GMAIL_HOST_URL + "/gmail");
		}

		// handle the close button
		private void close_onClick(object sender, System.EventArgs e) {
			this.Hide();
			this.lastCheckedText.Text = "Click account to update";
			this.threadPreviewText.Text = "";
			this.newThreadsList.Items.Clear();
		}

		// Updates the status page for the selected Gmail account.
		private void sessionList_onItemClick(object sender, EventArgs e) {

			ListViewItem selectedAccount = ((ListView)sender).SelectedItems[0];
			string accountName = selectedAccount.Text;

			foreach(GmailSession session in this.accounts) {
				if(session.Username == accountName) {

					// write last checked timestamp
					if(session.LastRefreshTime > new DateTime(0)) {
						this.lastCheckedText.Text = session.LastRefreshTime.ToString();
					} else {
						this.lastCheckedText.Text = "Never";
					}

					// write new message counts
					this.newThreadsList.Items.Clear();
					this.newThreadsList.Items.Add("Inbox: " + session.DefaultSearchCounts["Inbox"].ToString());
					foreach(DictionaryEntry pair in session.CategoryCounts) {
						if((int)pair.Value > 0) {
							this.newThreadsList.Items.Add(pair.Key + ": " + pair.Value);
						}
					}

					// write thread summaries
					string output = "";
					for(int i = 0; i < session.UnreadThreads.Count; i++) {
						output += (i + 1) + ". ";
						GmailThread msg = (GmailThread)session.UnreadThreads[i];
						output += Utilities.CleanHtml(msg.AuthorsHtml) + " - " + Utilities.CleanHtml(msg.DateHtml) + "\r\n";
						output += "[" + Utilities.CleanHtml(msg.SubjectHtml) + "]\r\n";
						output += Utilities.CleanHtml(msg.SnippetHtml) + "\r\n";
						output += "\r\n";
					}
					this.threadPreviewText.Text = output;

					// stop looping through accounts
					break;

				}
			}


		}

		// open Gmail browser window from the status page
		private void launchGmail_onClick(object sender, System.EventArgs e) {
			System.Diagnostics.Process.Start(GmailAdapter.GMAIL_HOST_URL + "/gmail");
		}

		// refresh all accounts
		private void refresh_onClick(object sender, System.EventArgs e) {
			RefreshAllSessionsDelegate refresher = new RefreshAllSessionsDelegate(this.RefreshAllSessions);
			IAsyncResult ar = refresher.BeginInvoke(new AsyncCallback(RefreshAllCallback), refresher);
			this.sessionList.Refresh();
			this.threadPreviewText.Clear();
			this.newThreadsList.Items.Clear();
			this.lastCheckedText.Text = "Click account to update";
		}

		// auto refresh event handler
		private void refreshTimer_onElapsed(object sender, System.Timers.ElapsedEventArgs e) {
			
			TimeSpan diff = DateTime.Now - this.lastRefresh;
			if(diff > new TimeSpan(0,this.refreshInterval,0)) {
				RefreshAllSessionsDelegate refresher = new RefreshAllSessionsDelegate(this.RefreshAllSessions);
				IAsyncResult ar = refresher.BeginInvoke(new AsyncCallback(RefreshAllCallback), refresher);
			}
		}

		private void refresh_onLeave(object sender, System.EventArgs e) {
			if(Convert.ToInt32(((TextBox)sender).Text) < 2 || Convert.ToInt32(((TextBox)sender).Text) > 60) {
				MessageBox.Show("The refresh interval can only be between 2 and 60 minutes.", "Invalid Refresh Interval", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
				((TextBox)sender).Undo();
				((TextBox)sender).SelectAll();
				((TextBox)sender).Focus();
			} else {
				// update refresh interval setting
				RegistryKey workingRegistry = Application.UserAppDataRegistry;
				workingRegistry.SetValue("RefreshInterval", Convert.ToInt32(this.refreshIntervalBox.Text));
				this.refreshInterval = Convert.ToInt32(this.refreshIntervalBox.Text);
			}
		}
		#endregion
	}
}