How do you get a string from a MemoryStream?

If I am given a MemoryStream that I know has been populated with a String, how do I get a String back out?

You can also use

Encoding.ASCII.GetString(ms.ToArray());

I don’t think this is less efficient, but I couldn’t swear to it. It also lets you choose a different encoding, whereas using a StreamReader you’d have to specify that as a parameter.