Question

I configured HealthMonitoring in my web application to log all exceptions in the database.

But, when I gracefully handle some exception by showing a nice message to the user, they are not logged in the database. If I something like Throw ex, the standard error page is be displayed and the error is not gracefully handled.

Is there something else I could add at the end of my error handler to tell the system to also log this error?

here an code sample:

Dim errorText As String = "Doing Something"
Try
   'Do Something

Catch ex As Exception
        DataActionError.Text = String.Format("There was a problem {0}. ", errorText)
        DataActionError.Visible = True
        'add something here?
End Try

and the healthMonitoring section of my web.config :

<healthMonitoring enabled="true">
  <eventMappings>
    <clear />
    <add name="All Errors" 
         type="System.Web.Management.WebBaseErrorEvent"
         startEventCode="0" 
         endEventCode="2147483647" />
  </eventMappings>

  <providers>
    <clear />
    <add connectionStringName="MyConnectionString"
         maxEventDetailsLength="1073741823"
         buffer="false" 
         name="SqlWebEventProvider"
         type="System.Web.Management.SqlWebEventProvider" />
  </providers>

  <rules>
    <clear />
    <add name="All Errors To Database" 
         eventName="All Errors" 
         provider="SqlWebEventProvider"
         profile="Default" 
         minInstances="1" maxLimit="Infinite" 
         minInterval="00:00:00" />
  </rules>
</healthMonitoring>

Answer 1

You can raise your own events which would then be consumed by the providers.
You can’t raise a WebBaseErrorEvent yourself, but you can create a custom web event and tweak your configuration to capture it too.
See
http://msdn.microsoft.com/en-us/library/ms998306
http://msdn.microsoft.com/en-us/library/ms227980.aspx