ASP.NET MVC: Controller OnException Override for ELMAH

OnException.cs

public class Sample : Controller
{
    protected override void OnException(ExceptionContext filterContext)
    {
        base.OnException(filterContext);
        if (!filterContext.ExceptionHandled) return;
    
        var httpContext = filterContext.HttpContext.ApplicationInstance.Context;
        var signal = ErrorSignal.FromContext(httpContext);
        signal.Raise(filterContext.Exception, httpContext);
    }
}