The presence of this attribute on a property of a subclass of
TargetControlPropertiesBase indicates that the property value is
required and the control can not be used without it. Absence of a
required property value causes an exception to be thrown during
creation of the control.
Namespace:
AjaxControlToolkitAssembly: AjaxControlToolkit (in AjaxControlToolkit.dll) Version: 1.0.10920.38393 (1.0.10920.0)