You cannot spread the definition of your classes over multiple files using the partial keyword. Partial classes are reserved for use by the IDE.

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Quizplus · Accepted Answer

Partial classes can be used to split the definition of a class over multiple files. This allows multiple developers to work on different parts of the same class without causing conflicts. Partial classes are not reserved for use by the IDE, they are a language feature of C#.

You Cannot Spread the Definition of Your Classes Over Multiple