ASP.NET defines an application as the sum of all files, pages, handlers, modules, and executable code that can be invoked or run in the scope of a given virtual directory (and its subdirectories) on a Web application server. For example, an "order" application might be published in the "/order" virtual directory on a Web server computer. For IIS the virtual directory can be set up in the Internet Services Manager; it contains all subdirectories, unless the subdirectories are virtual directories themselves.
Each ASP.NET Framework application on a Web server is executed within a unique .NET Framework application domain, which guarantees class isolation (no versioning or naming conflicts), security sandboxing (preventing access to certain machine or network resources), and static variable isolation.
ASP.NET maintains a pool of HttpApplication instances over the course of a Web application's lifetime. ASP.NET automatically assigns one of these instances to process each incoming HTTP request that is received by the application. The particular HttpApplication instance assigned is responsible for managing the entire lifetime of the request and is reused only after the request has been completed. This means that user code within the HttpApplication does not need to be reentrant.
发表于 @ 2009年09月23日 14:25:00 | 评论( 0 ) | 编辑| 举报| 收藏
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用户控件是ASP.NET中很重要的一部分，使用它可以提高程序代码的重用性，即一个用户控件在网页、用户控件或控件的内部都可以再次使用。本实例介绍用户登录的用户控件也可以在网站的任何地方再次使用。
技术要点
本实例介绍如何在ASP.NET中创建用户控件、如何使用用户控件，以及如何在用户控件中定义公开属性的实现方法。
......
假定有一个Product表，字段有（Id,Name,Quantity,...）将Quantity列用textbox格式来显示：
首先在Gridview中，Quantity列以TemplateField显示，其他的列属性设为只读，把显示格式设为TextBox
<asp:TemplateField HeaderText="Quantity">
<ItemTemplate>
&nbs ......
