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AllowDBNull Field

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".

NoteNote

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: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0
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