<configuration>
    <system.web>
        <healthMonitoring enabled="true">
            <rules>
                <add name="Mail Notifications on All Errors" eventName="All Errors" provider="SimpleMailWebEventProvider" profile="Default"/>
            </rules>
            <providers>
                <add name="SimpleMailWebEventProvider" type="System.Web.Management.SimpleMailWebEventProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" from="errors@havit.cz" to="errors@example.cz" subjectPrefix="MyApplication: " buffer="true" bufferMode="Notification" maxEventLength="4096" maxMessagesPerNotification="2"/>
            </providers>
        </healthMonitoring>
    </system.web>
</configuration>

class Program
{
    static void Main(string[] args)
    {
        ExceptionTracer.SubscribeToUnhandledExceptions();

        throw new InvalidOperationException("Chybka!");

        // ExceptionTracer.Default.TraceException(new ArgumentNullException("param", "Sakrapísek!"));
    }
}

static class Program
{
    [STAThread]
    static void Main()
    {
        ExceptionTracer.SubscribeToWindowsFormsThreadExceptions();

        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new Form1());
    }
}

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <system.diagnostics>
        <sources>
            <source name="Exceptions" switchValue="Error">
                <listeners>
                    <add name="LogFileListener"
                        type="System.Diagnostics.TextWriterTraceListener"
                         initializeData="Exceptions.log"
                    />
                    <add name="XmlListener"
                         initializeData="Exceptions.xml"
                         type="System.Diagnostics.XmlWriterTraceListener"
                    />
                </listeners>
            </source>
        </sources>
    </system.diagnostics>
</configuration>

using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using System.Windows.Forms;

namespace Havit.Diagnostics
{
    public class ExceptionTracer
    {
        /// <summary>
        /// Přihlásí ExceptionTracer k odběru všech neobsloužených výjimek (event AppDomain.CurrentDomain.UnhandledException).
        /// </summary>
        public static void SubscribeToUnhandledExceptions()
        {
            AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException);
        }
        private static void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e)
        {
            if (e.ExceptionObject is Exception)
            {
                TraceException((Exception)e.ExceptionObject);
            }
        }

        /// <summary>
        /// Přihlásí ExceptionTracer k odběru všech neobsloužených výjimek WinForm (event Application.ThreadException).
        /// </summary>
        public static void SubscribeToWindowsFormsThreadExceptions()
        {
            Application.ThreadException += new System.Threading.ThreadExceptionEventHandler(Application_ThreadException);
        }
        private static void Application_ThreadException(object sender, System.Threading.ThreadExceptionEventArgs e)
        {
            TraceException(e.Exception);

            // původní implementace obsluhy výjimky, WinForm dialog s chybou
            using (ThreadExceptionDialog excptDlg = new ThreadExceptionDialog(e.Exception))
            {
                DialogResult result = excptDlg.ShowDialog();
                if (result == DialogResult.Abort)
                {
                    Application.Exit();
                }
            }
        }

        /// <summary>
        /// Pošle do trace zadanou výjimku.
        /// </summary>
        /// <param name="exception">výjimka k zaznamenání</param>
        public static void TraceException(Exception exception)
        {
            TraceSource ts = new TraceSource("Exceptions");

            ts.TraceEvent(TraceEventType.Critical, 0, exception.ToString());

            ts.Flush();
            ts.Close();
        }
    }
}

<E2ETraceEvent xmlns="http://schemas.microsoft.com/2004/06/E2ETraceEvent">
<System xmlns="http://schemas.microsoft.com/2004/06/windows/eventlog/system">
  <EventID>0</EventID> 
  <Type>3</Type> 
  <SubType Name="Critical">0</SubType> 
  <Level>1</Level> 
  <TimeCreated SystemTime="2008-01-31T21:08:35.0625000Z" /> 
  <Source Name="Exceptions" /> 
  <Correlation ActivityID="{00000000-0000-0000-0000-000000000000}" /> 
  <Execution ProcessName="WindowsFormsApplication1" ProcessID="1232" ThreadID="1" /> 
  <Channel /> 
  <Computer>OSKAR</Computer> 
</System>
<ApplicationData>System.ApplicationException: Test !!! at WindowsFormsApplication1.Form1.button1_Click(Object sender, EventArgs e) in D:\Development\ExceptionLogging\WindowsFormsApplication1\Form1.cs:line 20 at System.Windows.Forms.Control.OnClick(EventArgs e) at System.Windows.Forms.Button.OnClick(EventArgs e) at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent) at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ButtonBase.WndProc(Message& m) at System.Windows.Forms.Button.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)</ApplicationData> 
</E2ETraceEvent>