This documentation is archived and is not being maintained.

String.IsNullOrEmpty Method

Updated: January 2011

Indicates whether the specified string is a null reference (Nothing in Visual Basic) or an Empty string.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public static function IsNullOrEmpty(
	value : String
) : boolean

Parameters

value
Type: System.String

The string to test.

Return Value

Type: System.Boolean
true if the value parameter is a null reference (Nothing in Visual Basic) or an empty string (""); otherwise, false.

IsNullOrEmpty is a convenience method that enables you to simultaneously test whether a String is a null reference (Nothing in Visual Basic) or its value is String.Empty. It is equivalent to the following code:

No code example is currently available or this language may not be supported.

The following example determines whether each of three strings has a value, is an empty string or is a null reference (Nothing in Visual Basic).

No code example is currently available or this language may not be supported.

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

.NET Compact Framework

Supported in: 3.5, 2.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

Date

History

Reason

January 2011

Expanded the Remarks section.

Customer feedback.

Show: