Five basic controls of Asp.net Ajax

1. scriptmanager is the script control manager responsible for managing script resources of Ajax controls on the page. Note: Only one scriptmanager can be added to a Web page. To use ASP. NET Ajax in any case, you must add a scriptmanager to the page.
2. scriptmanagerproxy is an extension of scriptmanager. It is a script manager used in projects that use the parent layout or user controls. When scriptmanager is used in the project page, a scriptmanagerproxy can be used in the master page or user control to proxy scriptmanager.
3. updatepanel is the most widely used Ajax control. If you embed updatepanel into a page, you can perform partial page refresh. Multiple updatepanel can be used for pages, and the updatepanel can be nested with each other.
4. updateprocess performs partial page refresh. Updateprocess provides a friendly information that refreshes the user status, such as prompting the customer that "loading data.
5. In winform development, many ProgramMembers are all dumped by the functions of the timer control. The timer control can regularly trigger some events, such as refreshing the entire page or part of the page.