How to minimize the flicker effect that may occur during navigation Articles, samples and tutorials

When a user views a Web page in an ASP.NET Web application that uses server controls, the user may experience a flicker effect. The flicker effect may occur when the user changes the value of a control. If the control generates a postback, the Web browser submits a request for a new Web page state to the Web server. When the new Web page state is rendered in the Web browser, the flicker effect may occur.

There are no simple ways to eliminate this flicker effect, because the Web page must be rendered again. Typically, this behavior is noticeable to the user.

Note When the connection speed between the Web client and the Web server is very fast, the flicker effect may be unnoticeable.

To minimize the flicker effect, minimize the number of postbacks, or eliminate postbacks. To do this, use one of the following methods, as appropriate for your situation.

Method 1: Use the ASP.NET 2.0 client callback manager
Use the ASP.NET 2.0 client callback manager to let Web pages submit requests to the Web server without using a full postback. Because the client callbacks do not include postback data, the client callbacks do not force the whole Web page to be updated in the Web browser. This minimizes the flicker effect that may occur during navigation.

For more information about the ASP.NET 2.0 client callback manager, visit the following MSDN Web site:
http://msdn.microsoft.com/msdnmag/issues/06/00/ASPNET20Overview/default.aspx (http://msdn.microsoft.com/msdnmag/issues/06/00/ASPNET20Overview/default.aspx)
For more information about how to implement client callbacks without using a postback, visit the following MSDN Web site:
http://msdn2.microsoft.com/en-us/library/ms178208.aspx (http://msdn2.microsoft.com/en-us/library/ms178208.aspx)

Method 2: Use a hidden frame in a Web page
Create a Web page that contains a visible frame and a hidden frame. For more information about how to do this, see method 2 in the "How to retain only the most recent Web page state in the Web browser history folder" section.

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