How using two projects in the same solution?

Hi
i try to use two projects in the same solution.
But i can't pass from my first project to my second project !
In my first project i use :

dim Mytest as new projectTwo.xxx

and i have that message "projectTwo.xxx is not defined"
Do i need any imports or whatever ?

Thanks.

Right click on project 1's references folder, choose add reference, go to the projects tab, and select project 2.

thak you for your help.
But now i have that message:
"a reference to 'ProjectTwo' could not be added. An assembly must have a 'dll' extension in order to be referenced"

Right Click on ProjectTwo, Properties, and change the output type to 'Class Library.'

thanks.
now i have my projectTwo underlines with that message:
"type expected" ????

What exactly are you typing there?

dim Mytest as new projectTwo.Form1?

or something like that?

I need to check my Dongle.
my program is in my first project and my Dongle is in my second project.
there are my codes, that should be easier....
thanks.