What is the difference between String.Empty and \"\" (empty string)?

Answer

In .Net pre 2.0, \"\" creates an object while String.Empty creates no object. So it is more efficient to use String.Empty.

Source of information

.Length == 0 is the fastest option, but .Empty makes for slightly cleaner code.

As @chadmyers mentioned, in version 2.0 and above of .Net, all occurrences of \"\" refer to the same string literal.

So \"\" is pretty equivalent to .Empty, but still not as fast as .Length == 0.