Help debugging - when does the Application_Start run in global.asax file?

Here's the snippet from my Global.asax:

<script runat="server">  
    void Application_Start(object sender, EventArgs e) {
        // log this call
        EventLogger.Log("ApplicationStart");
    }

    void Application_BeginRequest(object sen开发者_JS百科der, EventArgs e) {
        // log what the user is doing
        UsageLogger.Log(UsageLogger.GetServerVariables());
    }
</script>

When I open the log, I see many ApplicationStart calls interspersed with usage calls. Why does my application seem to restart so much?

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Application_Start fires once when the app starts up. Application_BeginRequest happens on every request.

This link helped in a simliar question here.

ASP.NET Case Study: Lost session variables and appdomain recycles

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That depends on the IIS configuration. the default is 20 minutes. The application will automatically restart if no request during this time period.