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Platform : Windows Forms
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Category : Tips

How can I tell my form is being used in design time and not runtime

Check the the property Form.DesignMode.

But, note that when in Visual Inheritance mode (designing a derived form), your Control’s DesignMode property will be true when the base form’s constructor gets executed in the design-time.

To workaround this, you could check if the app in which your control is running is not devenv.exe, as follows:

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