Global Error Handling for Web Services

I have a web project consisting of only web services. I need a global way of handling errors on the server so I can send emails, log in event log, etc. Global.asax doesn't work according to MSDN. How 开发者_开发知识库should I go about this? I have tried creating a soapExtension, but it is never hit.

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May be this will help

http://www.developer.com/net/csharp/article.php/3088231/Exception-Handling-in-Web-Services.htm