Trace Listerners

This code shows how to use the default trace listener that sends the race output to the Output window in the IDE. It also shows how to readd the default trace listener if the trace listeners collection has been cleared. The default trace listener by default is added to the trace listeners collection.

Use System.Diagnostics namespace

       string ProductType = "Computer";
        int Price = 2000;
        
        // Create instance of the default trace listener
        DefaultTraceListener tlDefault = new DefaultTraceListener();

        // Clear all trace listeners from the collection
        Trace.Listeners.Clear();

        // Add the default listener to the collection
        Trace.Listeners.Add(tlDefault);

        Trace.WriteLine("******  Trace OutPut Start  ******");
        Trace.WriteLine("Output window trace information");
        Trace.Indent();
        Trace.WriteLine("This line is indented");
        Trace.WriteLine("Product Type = " + ProductType);
        Trace.WriteLine("Price = $" + Price);
        Trace.WriteLineIf(Price > 1800, "Price > $1800");
        Trace.Unindent();
        Trace.WriteLine("******   Trace Output End   ******");