向ASP添加样式和脚本。NET web控件(ascx)，不重复包含指令

Consider to develop a web control (ASP.NET). What you would really like to do is styling and developing this control in a very good way, here's a very good way to do this (this is how I would like to do, further in this question I will explain why I cannot do this).Consider to develop a web control (ASP.NET). Wh