Good guidelines on naming bool properties

Question

Generally if there is a property that gets/sets a value for state, I use "Is", like:

Visibility:
.IsVisible

But for properties that gets/sets actions, what is best to use? Like:

Casting shadows:
.CastShadows

Should I use:

.DoesCastShadows

Is there a better alternative?

Answer 1

Much of the library uses something that would be like .IsShadowCastingEnabled.

For example, UIElement defines IsInputMethodEnabled and IsHitTestVisible.

The nice thing about this is that IsXXX makes it very clear that this is a boolean property.