Debug

• It is used to debug your code in development environment only.
• Debugging is the process of finding and fixing errors in your code.
• It works when solution configuration mode is Debug. In Release mode it does not write anything on the output window.
• In debugging there is no such facility to differentiate between message types (Information, Error, Warning).
• Example
  

  Debug.WriteLine("Debug Start");
  Debug.Indent();            
  Debug.WriteLine("Main Start");          
  Debug.WriteLine("Main End");
  Debug.Unindent();
  Debug.WriteLine("Debug End");
  Debug.Flush();
  Debug.Close();
  

Trace

• It is used to trace the execution of your code in development as well as production environment.
• Tracing is the process of collecting information about the program’s execution.
• It works in both solution configuration modes Debug and Release.
• In tracing we can easily differentiate between message types (Information, Error, Warning) using  Trace.TraceInformation, Trace.TraceError and Trace.TraceWarning.
• Example
  

  Trace.WriteLine("Trace Start");         
  Trace.Indent();
  Trace.TraceInformation("Information");
  Trace.TraceError("Error");
  Trace.TraceWarning("Warning");
  Trace.WriteLine("Main Start");
  Trace.WriteLine("Main End");
  Trace.Unindent();
  Trace.WriteLine("Trace End");
  Trace.Flush();
  Trace.Close();