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

.net double-quotes string
johnc picture johnc · Sep 30, 2008 · Viewed 93.4k times · Source

In .NET, what is the difference between String.Empty and "", and are they interchangable, or is there some underlying reference or Localization issues around equality that String.Empty will ensure are not a problem?

Answer

Brian R. Bondy picture Brian R. Bondy · Sep 30, 2008

In .NET prior to version 2.0, "" creates an object while string.Empty creates no objectref, which makes string.Empty more efficient.

In version 2.0 and later of .NET, all occurrences of "" refer to the same string literal, which means "" is equivalent to .Empty, but still not as fast as .Length == 0.

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

See the .NET specification for more information.

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