Using ASP. Application object to realize the function of online demographics

Note: Recently in Review ASP , in order to deepen the impression, will make some small Demo program, share to everyone.

1 Create a new ASP . NET Web site, edit the Global.asax file, and the modified file contents are as follows.

<%@ application Language= "C #"%> <script runat= "Server" > void Application_Start (object sender, EventArgs E    {//code run at application startup application["Currentusercount"] = 0; } void Application_End (object sender, EventArgs e) {//code to run at application shutdown} void application _error (object sender, EventArgs e) {//code to run in the event of an unhandled error} void Session_Start (object sender, EventArgs        e) {//code Application.Lock () running at the start of a new session;        application["Currentusercount"] = (int) application["Currentusercount"] + 1;    Application.UnLock ();         } void Session_End (object sender, EventArgs e) {//code that runs at the end of the session.        Note: The Session_End event is raised only if the sessionstate mode in the Web. config file is set to InProc.        If the session mode is set to StateServer//or SQL Server, the event is not raised.        Application.Lock ();        application["Currentusercount"] = (int) application["Currentusercount"]-1;    Application.UnLock (); } &LT;/script> 

2 Modify the Web. config file, add the following configuration node, new configuration node bits <system.web></system.web> nodes.

<sessionstate mode= "InProc" timeout= "1" cookieless= "false"/>

3 Add a label to the Default.aspx file to display the current number of people online.

protected void Page_Load (object sender, EventArgs e) {this    . Label1.Text = application["Currentusercount"]. ToString ();}

4 use IE and Chrome browser to access the application, get the results shown.

Using ASP. Application object to realize the function of online demographics