Reg:How to build a project when building another project implicitely

When we are building a project and that project contains dependency from another project then we have to add the dependency explicitly . Instead of doing like that is there is any way to build the dependent project while building the main project implicitly that is we have to take the project name from the command prompt and that will be dependent project name and that project has to be build first and then that dependency will be added to our main project........