There is no option to Add Existing Project

Question

To add a project when i right click to my solution there is no option to

add -> Existing Project.

What should i do to find it?

Answer 1

Use the File menu to add a project to solution.

File -> Add -> Existing Project

It looks like some of the default VS settings decide to hide the solution item from the Solution Explorer.

You can show it from Tools -> Options -> Project And Solutions and checking the checkbox called "Always Show Solution"

(from here)