SchemaTableColumn.AllowDBNull Field

Definition

Namespace:

System.Data.Common

Assembly:

System.Data.Common.dll

Source:

SchemaTableColumn.cs

Specifies whether value DBNull is allowed.

public: static initonly System::String ^ AllowDBNull;

public static readonly string AllowDBNull;

 staticval mutable AllowDBNull : string

Public Shared ReadOnly AllowDBNull As String 

Field Value

String

Remarks

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

Note

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.

See also

• ADO.NET Overview