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Control.DesignMode Property

.NET Framework 4

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)
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protected internal bool DesignMode { get; }

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, 3.5, 3.0, 2.0

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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DesignMode doesn't work when the control is being edited in the browser
When creating webparts, using DesignMode to determine whether teh control is being editing in the browser doesn't work. DesignMode is only used when teh control is being used in a tool such as Visual Studio or SharePoint Designer.

To determine whether the control is being edited in the browser use the WebPartManager.DisplayMode property. (http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.webparts.webpartmanager.displaymode.aspx)

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