Use Global.asax to log application level exception : Exception « Development « ASP.NET Tutorial

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2. Development
3. Exception

<%@ Application Language="C#" %>
<%@ Import Namespace="System.Diagnostics" %> 
<%@ Import Namespace="System.Text" %>

<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) 
    {
        // Obtain the URL of the request 
        string url = Request.Path;

        // Obtain the Exception object describing the error 
        Exception error = Server.GetLastError();

        // Build the message --> [Error occurred. XXX at url]
        StringBuilder text = new StringBuilder("Error occurred. ");
        text.Append(error.Message);
        text.Append(" at ");
        text.Append(url); 

        // Write to the Event Log 
        EventLog log = new EventLog();
        log.Source = "Core35 Log";
       // log.WriteEntry(text.ToString(), EventLogEntryType.Error);
    }
</script>