При создании из экземпляра по умолчанию форма ссылается на саму себя, что приводит к бесконечной рекурсии. В конструкторе форм укажите ссылку на форму с помощью "Me".

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The form referred to itself during construction from a default instance, which led to infinite recursion. Within the Form's constructor refer to the form using 'Me.'

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