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I'm trying to learn the built-in features of tracing. I can't figure out how to use the config to set the level (information, warn, error) that gets written to my listen. I have the default app.config with it . In my code, I use Trace.TraceInformation() and Trace.TraceError. All of the messages are written to my text file. I want to be able to change something in the app.config to make it record Info messages or just error messages. Module1.vb Sub Main(ByVal args() As String) Dim index As Integer = 0 For Each arg As String In args Trace.TraceInformation(String.Format("Sub Main(): arg({1}) = {0}", arg, index)) Trace.Flush() If arg.Split("=").Count = 2 Then If String.Compare(arg.Split("=")(0), "mode", True) = 0 Then _Mode = arg.Split("=")(1) End If index += 1 Next End Sub app.config <sources>  <source name="DefaultSource"> <listeners> <add name="FileLog"/>   </listeners> </source> </sources> <switches> <add name="DefaultSwitch" value="1" /> </switches> <sharedListeners> <add name="FileLog" type="Microsoft.VisualBasic.Logging.FileLogTraceListener, Microsoft.VisualBasic, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL" initializeData="FileLogWriter"/> <!-- Uncomment the below section and replace APPLICATION_NAME with the name of your

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