Gets or sets an instance of the System.Web.Caching.CacheDependency class associated with the cached user control output.
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The ControlCachePolicy.Dependency property delegates to the BasePartialCachingControl.Dependency property of the System.Web.UI.BasePartialCachingControl control that wraps the user control. When the System.Web.Caching.CacheDependency instance is invalidated, the user control is removed from the cache.