Convert.DBNull Field (System)

DBNull Field

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Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

.NET Framework Class Library

Convert..::.DBNull Field

Updated: May 2009

A constant that represents a database column that is absent of data; that is, database null.

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

Syntax

Visual Basic (Declaration)

Public Shared ReadOnly DBNull As Object

Visual Basic (Usage)

Dim value As Object

value = Convert.DBNull

public static readonly Object DBNull

Visual C++

public:
static initonly Object^ DBNull

JScript

public static final var DBNull : Object

Remarks

The DBNull field is equivalent to DBNull..::.Value, as the following example shows.

Visual Basic

Console.WriteLine(Convert.DBNull.Equals(DBNull.Value))
' Displays True.

Console.WriteLine(Convert.DBNull.Equals(DBNull.Value));
// Displays True.

Platforms

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.

Version Information