Thursday, August 1, 2013

Microsoft Visual Studio "Debug" VS "Release" mode

When we want to deploy our web application to live/local server, then we have two options for making built – Release mode and Debug mode. Both the modes have own importance and characteristics. The details about Release mode and Debug mode are as.

Debug Mode
Developer use debug mode for debugging the web application on live/local server. Debug mode allow developers to break the execution of program using interrupt 3 and step through the code. Debug mode has below features:
  • Less optimized code
  • Some additional instructions are added to enable the developer to set a break-point on every source code line.
  • More memory is used by the source code at run-time.
  • Scripts & images downloaded by webresource.axd are not cached.
  • It has big size, and runs slower.


Release Mode
Developer use release mode for final deployment of source code on live server. Release mode Dlls contain optimized code and it is for customers. Release mode has below features:
  • More optimized code
  • Some additional instructions are removed and developer can’t set a break-point on every source code line.
  • Less memory is used by the source code at run-time.
  • Scripts & images downloaded by webresource.axd are cached.
  • It has small size, and runs fast.


There is no difference in functionality of a debug dll and a release dll. usually, when we compile code in debug mode, we have a corresponding .pdb (program database) file. This .pdb file contains information that enables the debugger to map the generated IL (intermediate language) to source code line number. It also contains the names of local variables in the source code.

The Release mode enables optimizations and generates without any debug data, so it is fully optimized. . Lots of your code could be completely removed or rewritten in Release mode. The resulting executable will most likely not match up with your written code. Because of this release mode will run faster than debug mode due to the optimizations.


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