Set As Active or Startup project

if one or more projects are attached to the same solution, we may set any of the project and select Set As Active Project or Set as Startup project...
to select the current project as main project...

this will be very useful whenever an application has multiple projects for DLL and only one EXE application..But while running the application, it will makes the DLL as a main project So,,, it simply prompts you the Exe to load the DLL..

if we want to load the Exe project as a Startup projectit will be very useful...