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

Question

In .NET, what is the difference between String.Empty and \"\", and are they interchangable, or is there some underlying reference or Localization i

Answer 1

Coming at this from an Entity Framework point of view: EF versions 6.1.3 appears to treat String.Empty and "" differently when validating.

string.Empty is treated as a null value for validation purposes and will throw a validation error if it's used on a Required (attributed) field; where as "" will pass validation and not throw the error.

This problem may be resolved in EF 7+. Reference: - https://github.com/aspnet/EntityFramework/issues/2610 ).

Edit: [Required(AllowEmptyStrings = true)] will resolve this issue, allowing string.Empty to validate.