Export (0) Print
Expand All
This topic has not yet been rated - Rate this topic

SchemaTableColumn.AllowDBNull Field

Specifies whether value DBNull is allowed.

Namespace:  System.Data.Common
Assembly:  System.Data (in System.Data.dll)
public static readonly string AllowDBNull

Returns the string "true" if DBNull is allowed; otherwise "false".


Avoid setting AllowDbNull to "true" for primary key columns. A column defined as a primary key can be set to AllowDbNull, but a null value cannot be assigned to it.

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

Did you find this helpful?
(1500 characters remaining)
Thank you for your feedback
© 2014 Microsoft. All rights reserved.