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.NET Framework Class Library

Control.DesignMode Property

Gets a value indicating whether a control is being used on a design surface.

Namespace:  System.Web.UI
Assembly:  System.Web (in System.Web.dll)
Protected Friend ReadOnly Property DesignMode As Boolean

Property Value

Type: System.Boolean
true if the control is being used in a designer; otherwise, false.

The DesignMode property returns true to indicate that the control is being used in the context of a designer. Your custom controls can use this property when design-time behavior is different than run-time behavior.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0