Provides a simple rectangular placeholder representation that displays the type and ID of the control, and also additional specified instructions or information.
Namespace: System.Web.UI.Design Assembly: System.Design (in system.design.dll)
Notes to Inheritors
The typical design pattern is to try to get HTML markup through the associated control, and then if an error is encountered, call the GetErrorDesignTimeHtml method. If no markup is returned by the control, call the GetEmptyDesignTimeHtml method, which if it is not overridden to provide specific markup, calls the CreatePlaceHolderDesignTimeHtml method, which should contain information about the type and ID of the control.
The following code example demonstrates how to override the GetDesignTimeHtml method in a templated control designer. A string is then passed as the instruction parameter in a call to the CreatePlaceHolderDesignTimeHtml method, which provides the design-time HTML markup.
This code example is part of a larger example provided for the TemplateGroups property.
// Add instructions to the placeholder view of the controlpublicoverridestring GetDesignTimeHtml()
return CreatePlaceHolderDesignTimeHtml("Click here and use " +
"the task menu to edit the templates.");