NinethSense

 public bool ErrorFlag = false;
        public StringBuilder SiteString = new StringBuilder(string.Empty);
 
 
        private void btnCheck_Click(object sender, EventArgs e)
        {
            CheckSites();
        }
 
 
        private void CheckSites()
        {
            string sitestatus = "Ok";
            foreach (ListViewItem lvi in listView1.Items)
            {
                lvi.UseItemStyleForSubItems = false;   
                lvi.SubItems.Add("...");
 
		// Use some threading methods instead of DoEvents()
                Application.DoEvents(); 
 
                WebRequest request = WebRequest.Create(lvi.Text);
                HttpWebResponse response;
 
                try
                {
                    response = (HttpWebResponse)request.GetResponse();
                }
                catch
                {
                    response = null;
                }
                if (response == null || 
			response.StatusCode != HttpStatusCode.OK)
                {
                    SiteString.Append(" - " + lvi.Text + "\n");
 
                    lvi.ForeColor = lvi.SubItems[1].ForeColor = Color.Red; 
                    sitestatus = "Error";
                    ErrorFlag = true;
                }
                else
                {
                    response.Close();
                    lvi.SubItems[1].ForeColor = Color.Green;    
                    sitestatus = "Ok";
                }
 
                lvi.SubItems[1].Text = sitestatus;
 
 
            }
 
            if (ErrorFlag)
            {
                StringBuilder message = new StringBuilder();
 
 
                if (SiteString.Length > 0)
                {
                    message.Append("Below website(s) may need your/IT 
			attention:\n\n");
                    message.Append(SiteString.ToString());
                }
                else
                {
                    message.Append("SiteChecker application failed to 
			load the sites.txt file. Please inform IT person");
                }
                message.Append("\n\n\nThis is an automatic 
			notification from SiteChecker applicaiton.\n");
                message.Append("[Application created by PraVeeN 
				under C# WinForms on VS Express 2010]");
 
                SendMail(message.ToString());
 
            }
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            IEnumerable<string> sites;
            try
            {
                sites = File.ReadLines("sites.txt");
                foreach (var site in sites)
                {
                    listView1.Items.Add("http://" + site + "/");
                }
            }
            catch
            {
                ErrorFlag = true;
            }
 
	    //Application.DoEvents();
	    //CheckSites();
	    //Application.Exit();
        }
 
        private void SendMail(string content)
        {
		// Mail sending procedure
	}