How do you add an existing form to a new project?

Here’s an approach that doesn’t involve closing the project and reopening it:

1. Add the 3 existing form files (cs, Designer.cs and resx).
2. Now, exclude the 3 files you just added from the project.
3. Open the Add existing item explorer window and go to your project directory.
4. Select the cs file and Add.
5. Tada. all good