什么是使用用户控件的最佳做法？我的用户控制通常是提交服务器上的数据形式，他们都是为了重复使用的网页。

在哪里CSS样式应该放在用户控件内？或者在aspx页面和这些样式应该在网页或外部CSS？

同样成功或faulure消息通常是页面的一部分。但是，在使用用户控件应用户contorl告诉结果或消息吊牌的页面应该是控制内？

还有什么别的使用用户控件，同时考虑？

该网页是控制器和它做保存/编辑，因此它也应该有其显示结果的标签。

页和用户控件应该按以下方式进行通信

下面是一些相关信息： HTTP：// WWW 。codeproject.com / KB /用户控件/ Page_UserControl.aspx＃3

What are the best practices in using user controls ? my user controls are usually forms that submit data on server and they are made to reuse in pages.

Where css styles should be placed inside user control ? or in aspx page and these styles should be in page or external css ?

Similarly success or faulure message is usually a part of page. But in using user controls should user contorl tell the page about result or message lable should be inside the control ?

Any thing else to consider while using user controls ?

The page is the controller and it's doing the saving/editing, therefore it also should have the label which shows result.

Page and UserControls should communicate in the following way

Here are some more infos: http://www.codeproject.com/KB/user-controls/Page_UserControl.aspx#3