That's only possible if the project containing the form is a class library.
In other words: You cannot set a reference to another EXE file from another
project, but you can add references to class libraries within EXE and class
library projects.
In order to add a reference to a class library which is part of the same
solution select the project in the solution explorer, choose "Add/Remove
reference..." from its context menu and select the class library project on
the "Projects" tab.
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