Error Handling in Windows Service

How can i write generic error handler in my windows service? I tried the following code in OnStart method but it is not catching the exceptions.

protected override void开发者_StackOverflow OnStart(string[] args)
{

                AppDomain.CurrentDomain.UnhandledException += new 
UnhandledExceptionEventHandler(UnhandledExceptionTrapper);
                this.Start();
}

Is there something i am missing here?

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You're probably getting exceptions on background threads. Wrap all code in all event handlers in try/catch blocks.