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Required fields*

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    Technically, String.Empty is not a constant. It's a static readonly field. If it was a constant, there would be no difference between "" and string.Empty. Commented Jun 22, 2009 at 16:33
  • String.Empty is not a constant, it's a field. Its backing value is a constant, but you have some limitations by String.Empty not being a constant. For example, you can't use it as a value in a case clause of a switch statement. Commented Jun 22, 2009 at 16:35
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    Note that "" might create an extra string once. It's not like it's going to create a new string every time you go round the code. Commented Jun 22, 2009 at 16:40