The Global.asax file, also known as the ASP.NET application file, is used to create application and session-level events and objects in an ASP.NET Web application. It is an optional file that contains code for responding to application-level events, such as Application_Start, Application_End, Session_Start, Session_End, and Application_Error.

Example:

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.
}

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