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ControlDesigner.UpdateDesignTimeHtml Method

Refreshes the design-time HTML markup for the associated Web server control by calling the GetDesignTimeHtml method.

Namespace:  System.Web.UI.Design
Assembly:  System.Design (in System.Design.dll)

public virtual void UpdateDesignTimeHtml()

The UpdateDesignTimeHtml method is called by the design host to update the display of the associated Web server control at design time, such as when the control has been modified. Also, a control designer can call the UpdateDesignTimeHtml method after modifying values of the control to update the display of the control.

NoteNote:

If you are calling the ComponentChanged event, or using the PropertyDescriptor object to set properties, the IComponentChangeService interface calls the UpdateDesignTimeHtml method for you.

The following code example demonstrates how to respond to a Click event in a control designer to change the focus between regions in a multi-region control and use the UpdateDesignTimeHtml method to update the appearance of the control in the design host.

This code example is part of a larger example for the EditableDesignerRegion class.

// Handler for the Click event, which provides the region in the arguments. 
protected override void OnClick(DesignerRegionMouseEventArgs e)
{
    if (e.Region == null)
        return;

    // If the clicked region is not a header, return 
    if (e.Region.Name.IndexOf("Header") != 0)
        return;

    // Switch the current view if required 
    if (e.Region.Name.Substring(6, 1) != myControl.CurrentView.ToString())
    {
        myControl.CurrentView = int.Parse(e.Region.Name.Substring(6, 1));
        base.UpdateDesignTimeHtml();
    }
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0
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