What are the differences between `ToXXXX` and `AsXXXX` conversion methods?

Question

Is there any semantic difference between ToXXXX conversion methods and AsXXXX conversion methods in the .NET framework?

Examples of such methods are Object.ToString and Enumerable.AsEnumerable<T>.

Answer 1

If method returns the same instance but casted to another type, use AsXXX method. If method consntructs new instance of unrelated type using object data, use ToXXX method.