Global.asax file Info

<%@ Application Language="C#" %>
<%@ Import Namespace="System.Web" %>
<%@ Import Namespace="System.Web.SessionState" %>
<%@ Import Namespace="System.Net" %>
<%@ Import Namespace="System.Net.Mail" %>

<script runat="server">

    void Application_Start(object sender, EventArgs e)
    {
        // Code that runs on application startup
        Application["Hits"] = 0;
        Application["HitsCount"] = 0;
        Application["Sessions"] = 0;
        Application["TerminatedSessions"] = 0;
    }
    //The BeginRequest event is fired for every hit to every page in the site
    protected void Application_BeginRequest(object sender, EventArgs e)
    {
        Application.Lock();
        Application["Hits"] = (int)Application["Hits"] + 1;
        Application.UnLock();
    }
    void Application_End(object sender, EventArgs e)
    {
        //  Code that runs on application shutdown
        SmtpClient smtpClient = new SmtpClient();
        string strUname = ConfigurationManager.AppSettings["smtpuser"].ToString();
        string strPassword = ConfigurationManager.AppSettings["smtppass"].ToString();
        smtpClient.Credentials = new NetworkCredential(strUname, strPassword);
        smtpClient.Send("BlankSolution Error", "abc@abc.com", "Application Down", Server.GetLastError().Message);
    }

    void Application_Error(object sender, EventArgs e)
    {
        // Code that runs when an unhandled error occurs
        try
        {
            SmtpClient smtpClient = new SmtpClient();
            string strUname = ConfigurationManager.AppSettings["smtpuser"].ToString();
            string strPassword = ConfigurationManager.AppSettings["smtppass"].ToString();
            smtpClient.Credentials = new NetworkCredential("abc@abc.com", "JUShah12$");
            smtpClient.Send("BlankSolution error", "abc@abc.com", Server.GetLastError().Message, Server.GetLastError().InnerException.StackTrace);
            // Response.Redirect("~/ErrorPage/ErrorPage.aspx");
        }
        catch (Exception)
        {

        }
    }

    void Session_Start(object sender, EventArgs e)
    {
        // Code that runs when a new session is started
        Application.Lock();
        Application["Sessions"] = (int)Application["Sessions"] + 1;
        Application["HitsCount"] = (int)Application["HitsCount"] + 1;

        Session["AdminID"] = "";
        Session["AdminEmail"] = "";
        Session["AdminRole"] = "";
        Session["AdminFullName"] = "";

        Session["CenterID"] = "";
        Session["CenterName"] = "";
       
        Application.UnLock();
    }

    void Session_End(object sender, EventArgs e)
    {
        // Code that runs when a session ends.
        // Note: The Session_End event is raised only when the sessionstate mode
        // is set to InProc in the Web.config file. If session mode is set to StateServer
        // or SQLServer, the event is not raised.
        Application.Lock();
        Application["TerminatedSessions"] = (int)Application["TerminatedSessions"] + 1;
        Application.UnLock();
    }
   
</script>