Create a Hit Counter Using the Global.asax File in ASP.NET

You can place the below code in Global.asax file and you need to call that variable in the aspx page. Example:

Global.asax Code

     void Application_Start(object sender, EventArgs e)

        { 

            Application["TotalHitCount"] = 0;

        }

Not required to put anything in other events in this file if you want to test while Page loading.Keep the below code on Page_Load() like below and press F5 to test it.

Code Behind

protected void Page_Load(object sender, EventArgs e)

        {

            Application["TotalHitCount"] = Convert.ToInt32(Application["TotalHitCount"]) + 1;

            lblTotCount.Text = Application["TotalHitCount"].ToString();

        }

Otherwise you can use like below in place of Page_Load(), 

Alternative Procedure

void Session_Start(object sender, EventArgs e)

        {

            // Code that runs when a new session is started

            Application.Lock();

            Application["TotalHitCount"] = Convert.ToInt32(Application["TotalHitCount"]) + 1;

            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["TotalHitCount"] = Convert.ToInt32(Application["TotalHitCount"]) - 1;

        }

Show or use it as per your application's requirement.