Beginning Ajax With ASP.NET (2006).pdf

Other Ajax Frameworks for .NET
Switch to the source window to update the ComplexControls class.
public partial class ComplexControls : ComfortASP.ComfortASP_Page
{
protected void Page_Load(object sender, EventArgs e)
{
this.HiddenFormPostBack = true;
}
protected void btnLoadResources_Click(object sender, EventArgs e)
{
System.Data.DataSet ds;
ds = new System.Data.DataSet();
ds.ReadXml(Server.MapPath(“~/App_Data/Resources.xml”));
}
this.grdResources.DataSource = ds;
this.grdResources.DataBind();
}
protected void grdResources_SelectedIndexChanged(object sender, EventArgs e)
{
this.lblSelectedIndex.Text =
this.grdResources.SelectedIndex.ToString();
}
The page will inherit from the ComfortASP.NET base page and will turn on the HiddenFormPostBack
property in the Page_Load method. When the Load Resources button is clicked, you will load the data
from the Resources.xml file and bind it to the GridView control. Finally, when an item in the grid is
selected, the SelectedIndex is printed to the lblSelectedIndex label on the page.
You can now launch the application in the browser to test your code.
Example 3: ComfortASP.NET Manager Control
The ComfortASP.NET Manager control gives you a centralized place to administer the page’s Ajax capabilities.
The manager control provides services that implement many common requirements. We will
review some of the more common features of the control here, but please refer to the ComfortASP.NET
web site for full documentation of the Manager control.
If you want to stop a user from repeatedly clicking on a button that initiates an Ajax call, you might
choose to disable the button once the call is dispatched. ComfortASP.NET makes it easy to disable these
controls. The manager’s DisableFormWhilePostBack property will automate this process of enabling
or disabling the controls on a page during a callback to the server. If the property is set to true, then all
controls are disabled during an Ajax call; otherwise, the controls are left alone.
Ajax applications face the challenge that the server will not always respond in a timely manner. Consider
what the user would think when he or she clicks a button and nothing happens on the page for well over
a minute, or perhaps never. The ComfortASP.NET Manager control has a built-in safeguard against this
situation. The HiddenRequestTimeout property will define the number of seconds the page should wait
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