<Table(Name:="Employees")>  _
Public Class Employees
    Private _LastName As String
    ' …
    <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.OnPropertyChanging("LastName")
                Me._LastName = value
                Me.OnPropertyChanged("LastName")
            End If
        End Set
    End Property
End Class

[Table(Name="Employees")]
public class Employees
{
    private string _LastName;    
    // …
    [Column(Storage="_LastName", DbType="NVarChar(20) NOT NULL", 
        CanBeNull=false)]
    public string LastName
    {
        get
        {
            return this._LastName;
        }
        set
        {
            if ((this._LastName != value))
            {
                this.OnPropertyChanging("LastName");
                this._LastName = value;
                this.OnPropertyChanged("LastName");
            }
        }
    }
}