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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.data.linq.mapping.columnattribute.canbenull below:

ColumnAttribute.CanBeNull Property (System.Data.Linq.Mapping) | Microsoft Learn

ColumnAttribute.CanBeNull Property Definition

Gets or sets whether a column can contain null values.

public:
 property bool CanBeNull { bool get(); void set(bool value); };

public bool CanBeNull { get; set; }

member this.CanBeNull : bool with get, set

Public Property CanBeNull As Boolean

Property Value

Default = true.

Examples

[Column(Storage="_LastName", DbType="NVarChar(20) NOT NULL", CanBeNull=false)]
public string LastName
{
    get
    {
        return this._LastName;
    }
    set
    {
        if ((this._LastName != value))
        {
            this.OnLastNameChanging(value);
            this.SendPropertyChanging();
            this._LastName = value;
            this.SendPropertyChanged("LastName");
            this.OnLastNameChanged();
        }
    }
}

<Column(Storage:="_LastName", DbType:="NVarChar(20) NOT NULL", CanBeNull:=false)>  _
Public Property LastName() As String
    Get
        Return Me._LastName
    End Get
    Set
        If ((Me._LastName = value)  _
                    = false) Then
            Me.OnLastNameChanging(value)
            Me.SendPropertyChanging
            Me._LastName = value
            Me.SendPropertyChanged("LastName")
            Me.OnLastNameChanged
        End If
    End Set
End Property

Remarks

If you set this value to false, the data in the corresponding column is assumed to be non-null.

Note

This property is duplicated from the DbType property for convenience. The CreateDatabase method uses only the DbType property. For this reason, you must specify whether a column can contain null values in the DbType property also.

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