The BLL consists of value providers that provide data to the Ajax-enabled controls, and server-side validators that provide server validation for HTML form data.
BLL包括向支持Ajax的控件提供数据的值提供程序，以及为HTML表单数据提供服务器验证的服务器端验证程序。
If validation is being performed on the server, validation controls are not rendered to the page unless an error occurs and they therefore take up no space whatsoever.
如果验证是在伺服器上执行的，除非发生错误，否则验证控制项不会呈现在网页上，因此不会占用任何空间。
Gets or sets the name for the group of controls for which the button control causes validation when it posts back to the server.
获取或设置按钮控件回发到服务器时所导致验证的控件组的名称。
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