Keeps the state and visual model for a custom visual web control. The state is used to preserve data related to layout and rendering of a web control, which is important for web controls since they are disposed after they have been rendered. Typically, this can be used to implement more efficient tooltips. The state is cleared when the model must be re-rendered, that is, when the TVisual's GetRenderTrigger  fires.

public sealed class VisualControlState<TVisual, TValue> : CustomControlState<TVisual>
where TVisual : VisualContent 
where TValue : class

public sealed class VisualControlState<TVisual, TValue> : CustomControlState<TVisual>
where TVisual : VisualContent 
where TValue : class