Empty Field
.NET Framework Class Library
String..::.Empty Field

Updated: July 2008

Represents the empty string. This field is read-only.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)
Visual Basic (Declaration)
Public Shared ReadOnly Empty As String
Visual Basic (Usage)
Dim value As String

value = String.Empty
C#
public static readonly string Empty
Visual C++
public:
static initonly String^ Empty
JScript
public static final var Empty : String

The value of this field is the zero-length string, "".

In application code, this field is most commonly used in assignments to initialize a string variable to an empty string. To test whether the value of a string is String..::.Empty, use the IsNullOrEmpty method.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

Date

History

Reason

July 2008

Added information on field usage to the Remarks section.

Information enhancement.

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((object)"") == String.Empty      Ris Orsa ... ls182   |   Edit   |   Show History

Framework 3.5

((object)"") == String.Empty -> False
((object)"") == "" -> True
String.Empty == "" -> True
("") == String.Empty -> True

Framework 1.1

((object)"") == String.Empty -> True

Math:

if a=b and b=c then a=c

If String.Empty == "" AND ((object)"") == "" THEN String.Empty == ((object)"")

Framwork 1.1 GOOD

Framework 3.5 BAD

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Not bad, just different.      Livery   |   Edit   |   Show History
Your reasons above...

http://blogs.msdn.com/ericlippert/archive/2009/09/28/string-interning-and-string-empty.aspx

basically you get faster comparisons and use less memory when using intern strings (""), but a gain there equals a loss later as the GC needs to determine if it should collect it. So you could end up using up more memory than saved.

Theres a good remark if you navigate to the String.Intern() method.
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