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String.IsNullOrEmpty Method

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

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

static member IsNullOrEmpty : 
        value:string -> bool 

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 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.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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