Raising event in a usercontrol from another usercontrol?

That's because in your code you raise an event on a new UserControl2. For your specific example the code of the UserControl1. Button1_Click event should be like this.

In general, only the event owner can raise an event. There are exceptions to this (such as with Button. PerformClick in Windows Forms, but they have to be specifically provided by the class in question.

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