What is Global.asx file in asp.net

The Global.asax file ,also known as the ASP.NET application file,is an optional file that contains code for responding to application –level events raised by ASP.NET or by HttpModules.

 How to add Global.asax file in asp.net:

Solution Explorer ->Add new item->Global.asax file  click add. 

 

Global.asax file code:

<%@ Application Language="C#" %>

<script runat="server">

    void Application_Start(object sender, EventArgs e)

    {

        // Code that runs on application startup

    }

   

    void Application_End(object sender, EventArgs e)

    {

        //  Code that runs on application shutdown

    }

       

    void Application_Error(object sender, EventArgs e)

    {

        // Code that runs when an unhandled error occurs

    }

    void Session_Start(object sender, EventArgs e)

    {

        // Code that runs when a new session is started

    }

    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.

    }

      

</script>