What is the difference between String.Empty and “” and null? [duplicate]

Question

Possible Duplicate:
What is the difference between String.Empty and “”

Is "" equivalent to String.Empty?

Which is preferred for initializing string values?

Answer 1

public sealed class String {
    //...
    public static readonly String Empty = "";
    //...
}

Use null when you want to represent that there is no value;

Use String.Empty when you want to represent that there is a value, but the value is a blank string.

Answer 2

String.Empty because it is a static variable, rather than "" which has to create a new string, and null means that you must then set the string equal to a new instance of a string.

(thanks for the correction)

Answer 3

Yes. And String.Empty, but please don't worry about it.

The difference between String.Empty and “” are pretty small, but there is a difference. “” actually creates an object, it will likely be pulled out of the string intern pool and String.Empty creates no object, so if you are really looking for ultimate memory efficiency, I suggest String.Empty. However, you should keep in mind the difference is so trival you will like never see it in your code…