.NET Framework 4.6 and 4.5
Determines whether the component is in design mode when implemented by a class.
abstract DesignMode : bool with get
Type: System.Booleantrue if the component is in design mode; otherwise, false.
The design mode indicator is stored in the ISite; therefore, if the Component does not have an ISite associated with it, this property is always false.
Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
.NET Framework Client Profile
Supported in: 4, 3.5 SP1
Supported in: 3.0, 2.0, 1.0
Supported in: Windows Phone 8.1
Supported in: Windows Phone Silverlight 8.1
Supported in: Windows Phone Silverlight 8