What is an UpdatePanel control?

What is an UpdatePanel control?

UpdatePanel controls work by specifying regions of a page that can be updated without refreshing the whole page. This process is coordinated by the ScriptManager server control and the client PageRequestManager class. When partial-page updates are enabled, controls can asynchronously post to the server.

What is async postback trigger?

Converts postbacks into async callbacks Typically used to trigger updates when controls outside an UpdatePanel post back If ChildrenAsTriggers=”false”, can be used to specify which controls inside UpdatePanel should call back rather than post back.

How many types of triggers are present in UpdatePanel?

Answer: There are 2 types of triggers.

Why do we use UpdatePanel in asp net?

Introduction. UpdatePanel controls are a central part of AJAX functionality in ASP.NET. They are used with the ScriptManager control to enable partial-page rendering. Partial-page rendering reduces the need for synchronous postbacks and complete page updates when only part of the page has to be updated.

How do I stop UpdatePanel from refreshing?

Another possible reason is that if the page has ClientIDMode=”static” , then controls that you expect to refresh just the UpdatePanel will refresh the whole page. To fix the problem, you just need to set ClientIDMode=”AutoID” on the control(s) which should trigger the UpdatePanel post back.

What causes postback?

PostBack is the name given to the process of submitting an ASP.NET page to the server for processing. PostBack is done if certain credentials of the page are to be checked against some sources (such as verification of username and password using database).

What is difference between AsyncPostBackTrigger and PostBackTrigger?

The AsyncPostBackTrigger “wires” up these controls to trigger an asynchronous post back. Conversely, controls declared inside an update panel will trigger an asynchronous call by default. The PostBackTrigger short circuits this, and forces the control to do a synchronous post back.

What is PostBackTrigger?

Remarks. Use the PostBackTrigger control to enable controls inside an UpdatePanel to cause a postback instead of performing an asynchronous postback. Use the RegisterPostBackControl method of the ScriptManager control to programmatically register a postback control.

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