VS2010 currently does not hit the breakpoint. No symbol resolution has been loaded for the document

VS2010 when doing the project found that breakpoints can only be hit on the web layer, and other layers such as the BLL DAL model, etc. can not hit.

Here are two modes: Debug and Release
Debug is often called a debug version, it contains debugging information, and does not make any optimizations to facilitate the programmer to debug the program. Release, known as the release version, is often optimized to make the program optimal in terms of code size and speed, so users can use it well.

All of them are unable to enter other DLLs because your current version may be release, change it to debug recompile. After the breakpoint, enter it casually.

VS2010 currently does not hit the breakpoint. No symbol resolution has been loaded for the document