National Instruments 373392C-01 User Manual download pdf (Page 67)

Chapter 2 Measurement Studio .NET Class Libraries

AutoRefresh Control

Use the AutoRefresh control to update a Web control or a group of Web

controls on the client at a specified interval.

The AutoRefresh control uses the ASP.NET client callback architecture to

update a control or a group of controls at a specified interval. The

AutoRefresh control sets up a timer inside the browser using Javascript.

When the timer elapses, the AutoRefresh updates the controls in the

AutoRefresh group. For down-level browsers, the controls update when the

page posts back to the server. If the client browser supports client callbacks,

the client-side script rendered by the AutoRefresh control uses a client

callback to update the associated controls on the client without posting the

page back to the server.

Note The AutoRefresh control is designed to work with the ASP.NET AJAX UpdatePanel

and Timer controls in Visual Studio 2008.

AutoRefresh Callback

This feature provides a mechanism for updating the

RefreshManager.Enabled and AutoRefresh.Interval properties

for

AutoRefresh from within the AutoRefresh.Refresh callback,

allowing you to turn off the AutoRefresh or change the Interval during an

asynchronous HTTP request without causing a postback.

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National Instruments 373392C-01 User Manual Page 67