If you have code in the Load-event of a Windows usercontrol, it will fire when the usercontrol is shown in Visual Studio at design-time. This can be troublesome if the code doesn't compile or needs some runtime-only variables.
However all Windows forms controls (forms, usercontrols etc.) inherits from ComponentModel which in turn has a property that's called DesignMode. This property is true when the Component (control in our case) is shown in designmode in Visual Studio.
Beware for this special case though...
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