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Possible Duplicate:
What is the difference between String.Empty and “”
Which of the following should I use for assigning an empty string and why?
string variableName = "";
or
string variableName = string.Empty;
String.Emptyis what is normally recommended.Why? Because it conveys meaning, you are very explicitly saying that you want the string to be empty.
Additionally,
""creates a string object (this object will be reused across the applications, because strings in .NET are interned),String.Emptydoes not create a new object. See here.