Beginning Ajax With ASP.NET (2006).pdf

Chapter 9
Try It Out
Using PanelUpdater Control
Begin by adding a new web form to the solution, naming it PanelUpdater.aspx. Make sure that you are
in source view, and add the following line after the Page directive line found at the top of the ASPX page.
The Register tag will make the ComfortASP.NET framework available to the page.
Continue by adding the following markup between the tags:
Message Count:
The ASP.NET panel is the container for the section of the page to update. The ComfortASP.NET
PanelUpdater control will handle generating the client-side code to create the timeout behavior. Be sure
to activate the PanelUpdater by setting the Active property equal to true. The TimerIntervalUpdate
property will take a value for the number of seconds you want the browser to wait before contacting the
server. Finally, the label at the end of the listing will take the latest information from the server and print
the message count back to the user.
Now switch to the code window to update the PanelUpdater class.
public partial class PanelUpdater : ComfortASP.ComfortASP_Page
{
private int MessageCount
{
get
{
if (this.ViewState[“messageCount”] == null)
{
return 0;
}
else
{
return Convert.ToInt32(this.ViewState[“messageCount”]);
}
}
set
{
this.ViewState.Add(“messageCount”, value);
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