Gets a value indicating whether the control is in either template viewing or editing mode in the design host. The ControlDesigner.InTemplateMode property is read-only.
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A Web server control is in template mode when a read-only template is currently being viewed or an editable template is being edited in a design host such as vsprvslong.
The System.Web.UI.Design.ControlDesigner class supplies a default System.Web.UI.Design.ViewEventHandler object to update the ControlDesigner.InTemplateMode value when the template mode changes for the associated control. Custom designers that are derived from the System.Web.UI.Design.TemplatedControlDesigner class can override the TemplatedControlDesigner.OnTemplateModeChanged method to perform additional processing when the template editing mode changes for a control in the design host.