DEBUG CLASS

Namespace System.Diagnostics
Provides a set of methods and properties that help in debugging the code
This class can not be inherited, i.e it is sealed
This class provides methods to display an Assert dialog box, and to emit an assertion that will always fail
Provides write methods in various flavors like Write, WriteLine, WriteIf, WriteLineIf
To enable debugging in C#, add the /d:DEBUG flag to the compiler command line
or, add #define DEBUG to the top of the code file
Debug is DISABLED in release builds by default, so no executable code is generated for Debug methods

TRACE CLASS

Namespace System.Diagnostics
Provides a set of methods and properties that help in tracing the execution of the code
Methods and properties of Trace class can be used to monitor the health of an application running in real-life settings
Tracing helps in isolating problems and fixing them without disturbing a running system
To enable Tracing in C#, add the /d:TRACE flag to the compiler command line
or, add #define TRACE to the top of the code file
In VS2005 trace is ENABLED by default. Therefore, code is generated for all Trace methods in both release and debug builds
To set the AutoFlush and IndentSize in Web.Config, specify trace settings as under:
<configuration>
<system.diagnostics>
<trace autoflush="false" indentsize="3">
</system.diagnostics>
</configuration>