. NET in Global.asax easy to implement site access statistics __.net

The specific principles are:
At the beginning of the application, read the numbers from a file and put them in a application.
This is mainly to prevent the site from restarting when the zero clean
And then there's session_start, variable +1,
Update the data again at application_end time,
The code is as follows:

<%@ application Language= "C #"%>
<%@ Import Namespace = "System.Data.SqlClient"%>

<script runat= "Server" >

void Application_Start (object sender, EventArgs e)
{
Code that runs when the application starts
SqlConnection con = new SqlConnection ();
Con. ConnectionString = configurationmanager.connectionstrings["tongjiconnectionstring"]. ConnectionString;
Con. Open ();
SqlCommand cmd = new SqlCommand ("SELECT * from Liulantongji", con);
int count = Convert.ToInt32 (cmd. ExecuteScalar ());
Con. Close ();
application["Total" = count;

}

void Application_End (object sender, EventArgs e)
{
Code that runs when the application shuts down
SqlConnection con = new SqlConnection ();
Con. ConnectionString = configurationmanager.connectionstrings["tongjiconnectionstring"]. ConnectionString;
Con. Open ();
SqlCommand cmd = new SqlCommand ("update Liulantongji set totalnum =" + application["Total"]. ToString (), con);
Cmd. ExecuteNonQuery ();
Con. Close ();

}

void Application_Error (object sender, EventArgs e)
{
Code that runs when an unhandled error occurs

}

void Session_Start (object sender, EventArgs e)
{
session["admin" = null;
session["Admintype"] = null;
Code that runs when a new session starts
Application.Lock ();
application["Total"] =convert.toint32 (application["Total") + 1;
Application.UnLock ();

}

void Session_End (object sender, EventArgs e)
{
Code that runs at the end of the session.
Note: Only the sessionstate mode in the Web.config file is set to
The Session_End event is raised when InProc. If the session mode is set to StateServer
or SQL Server, the event is not raised.



}

</script>