问无法从代码隐藏访问我的类。类是App_Code文件夹

EN

Public Class mySimpleClass

   'Private member variables whose data is obtained from user input
    Private mUserID as String

   'Class Properties
    Public Property UserID() as Integer
       Get
          Return mUserID
       End Get

       Set(ByVal Value as Integer)
          mUserID = Value
       End Set
    End Property

    'Class Methods
    Public Function DisplayUserID() as String
       Return this.UserID
    End Function

End Class

Partial Public Class _Default
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim obj As New mySimpleClass()
    End Sub

End Class