A problem with the inline page code in ASP.NET

Such as
The parent page:

 
public class BasePage : System.Web.UI.Page 
{ 
public int HotelID 
{ 
get 
{ 
return 1; 
} 
} 
} 

Child pages:

 
public partial class UpdateAlbumAttachments : BasePage 
{ 
public new int HotelID 
{ 
get 
{ 
return 0; 
} 
} 
} 

When writing the check-in code in *.aspx, only this.HotelID will be read, even if the property value read using base.HotelID is still this.HotelID
For example, in UpdateAlbumAttachments.aspx < %=base.HotelID % > You get a 0 instead of a 1
Of course, you can get base.HotelID in the background code
It can only be distinguished by different names. I don't know why, is it ASP. bug of NET?

((BasePage) this).HotelID can get 1