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I'd finished my first module and its Windows Form Application. It contains 5 forms and those forms calling each other (Form1.Show, Form2.Show, Form3.Show) something like that. But then knowing in my professor that it should be an Class Library Application Type. When my professor try to integrate it in the main application. Now all referencing forms where underlined as error. I can't call the form2, nor form3. What should i do ?
I would build a testApp so that I could test out the library before turning it in to the prof. Aside from that, what is the error shown when you hover over the underlined words? I can think of a couple possible issues. For one thing, class libraries often don't get the same references added automatically that application projects do, so you might just be missing the reference to Windows.Forms. It may also have to do with default instances, as you seem to be using them since you just mention form2 and form3, which would be the names of default instances (though that might be just for this post).
Either way, the error message for those problems should make it considerably more clear.