Which one to use: Managed vs. NonManaged hashing algorithms

Question

In a regular C# application which class to use for hashing: xxxManaged or xxx (i.e SHA1Managed vs SHA1) and why?

Answer 1

Managed library is safer to use and does not incur the PInvoke overhead. Also for long-running applications (ASP.NET) where memory leaks can accumulate to bring down the server, managed is also preferable.