Yes and no. Yes, you can have as many partial classes as you wish. No, you cannot (and should not!) List them on your page.
<%@ Page
Language="C#"
inherits="Default" %>
in Default.aspx.cs:
public partial class Default
{ }
in Default2.aspx.cs:
public partial class Default
{ }
- . CLR. # ; asp.net .
, , . / . db , , , "", DI.
, ; , . DI . Unity DI . , .