Here is a very simple web.config file that sends an e-mail whenever an unhandled error occurs. Pay attention to the <healthMonitoring> and <system.net> section. These are the important ones that makes it work.
<?xml version="1.0"?>
<configuration>
<appSettings/>
<connectionStrings/>
<system.web>
<compilation debug="false" />
<trace enabled="true" localOnly="false" />
<healthMonitoring enabled="true">
<providers>
<add name="EmailProvider"
type="System.Web.Management.SimpleMailWebEventProvider"
from="you@domain.com"
to="you@domain.com"
subjectPrefix="Error: "
buffer="true"
bufferMode="Notification" />
</providers>
<rules>
<add provider="EmailProvider" name="All App Events" eventName="All Errors" />
</rules>
</healthMonitoring>
</system.web>
<system.net>
<mailSettings>
<smtp from="you@domain.com">
<network host="smtp.domain.com" />
</smtp>
</mailSettings>
</system.net>
</configuration>
How easy can it get? Truly amazing.
http://blog.madskristensen.dk/post/Health-monitoring-in-ASPNET-20.aspx
http://aspnetresources.com/articles/aspnet_2_0_health_monitoring.aspx
http://msdn2.microsoft.com/en-us/library/ms998306.aspx
http://msdn2.microsoft.com/en-us/library/yc5yk01w.aspx