Main Menu driven programme for different Projects

Question

For an assignment i had different DataStructures (in C#) that I needed to implement. That part was easy. But I am also required to make a main menu driven programme for all those projects. So i searched a bit and found out a way. For example i had a project named linkedlist with namespace as Implementing_LinkedList and another project queue and namespace as Implementing_queue. To make a menu driven programme i just created another project named Assignment with namespace assignment. Mainconsole. Then i changed the namespace of linkedlist project to Assignment.Implementing_LinkedList and similarly with queue.Also made all the methods and classes public. Then i just called the main method of linkedlist inside main method of assignment as follows

Implementing_LinkedList.Program.Main();

Main method is inside a class named program in linked list project and it worked. Now i want to know how this worked because specifically .MainConsole part and if there is any other way to acheive this.

(Also i am pretty new to Stack overflow so pardon me for the extra long question but i didn't want to skip any details)