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  4. Write the exception information to the event log (C#)
File: Default.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="ErrorTestLog" %>



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File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.Diagnostics;
public partial class ErrorTestLog : System.Web.UI.Page
{
    protected void cmdCompute_Click(object sender, EventArgs e)
    {
        try
        {
            decimal a, b, result;
            a = Decimal.Parse(txtA.Text);
            b = Decimal.Parse(txtB.Text);
            result = a / b;
            lblResult.Text = result.ToString();
            lblResult.ForeColor = Color.Black;
        }
        catch (Exception err)
        {
            lblResult.Text = "Message: " + err.Message + "";
            lblResult.Text += "Source: " + err.Source + "";
            lblResult.Text += "Stack Trace: " + err.StackTrace;
            lblResult.ForeColor = Color.Red;
            EventLog log = new EventLog();
            log.Source = "DivisionPage";
            log.WriteEntry(err.Message, EventLogEntryType.Error);
        }
    }
}