Many developers always generate debug symbols so that they can be used to debug even the production environment if need be and to a great extent this can be considered as a best practice, but that does not mean that organizations deploy their Debug Symbols.
If you would like to generate debug symbols for your application you can do so by going to the “Build” tab in the Property Pages and clicking “Advanced” bottom at the bottom. Here you will have different options for the level of debug symbols you would like to generate for your Web Application Projects (WAP)
Generation of Debug symbols can be configured per "Build Configuration"... To learn more about managing build configurations click here
Hope this helps...