什么是C#readonly关键字的VB.NET等价物？

Class MyClass
    ' 声明一个只读属性
    Public ReadOnly Property MyReadOnlyProperty As String
        Get
            Return "This is a read-only property."
        End Get
    End Property

    ' 声明一个只读字段
    Public ReadOnly MyReadOnlyField As String = "This is a read-only field."
End Class

Sub MySub()
    ' 声明一个只读的局部变量
    Const MyReadOnlyVariable As String = "This is a read-only variable."
End Sub