ASP.NET AdRotator Control


The AdRotator control randomly selects banner graphics from a list, which is specified in an external XML schedule file.

This external XML schedule file is called the advertisement file.

Syntax of adding an AdRotator

 
<asp:AdRotator  runat = "server" AdvertisementFile = "adfile.xml"  Target =  "_blank" />

The Advertisement File

The advertisement file is an XML file, which contains the information about the advertisements to be displayed.

There are the following standard XML elements that are commonly used in the advertisement file:

Element Description
Advertisements Encloses the advertisement file.
Ad Delineates separate ad.
ImageUrl The path of image that will be displayed.
NavigateUrl The link that will be followed when the user clicks the ad.
AlternateText The text that will be displayed instead of the picture if it cannot be displayed.
Keyword Keyword identifying a group of advertisements. This is used for filtering.
Impressions The number indicating how often an advertisement will appear.
Height Height of the image to be displayed.
Width Width of the image to be displayed.

Apart from these tags, customs tags with custom attributes could also be included. The following code illustrates an advertisement file ads.xml:


   
      fl1.jpg
      http://www.fastlearning.in
      
         Order flowers, roses, gifts and more
      
      20
      Learn
   


Properties and Events of the AdRotator Class

The AdRotator class is derived from the WebControl class and inherits its properties.

Properties Description
AdvertisementFile The path to the advertisement file.
AlternateTextFeild The element name of the field where alternate text is provided. The default value is AlternateText.
DataMember The name of the specific list of data to be bound when advertisement file is not used.
DataSource Control from where it would retrieve data.
DataSourceID Id of the control from where it would retrieve data.
Font Specifies the font properties associated with the advertisement banner control.
ImageUrlField The element name of the field where the URL for the image is provided. The default value is ImageUrl.
KeywordFilter For displaying the keyword based ads only.
NavigateUrlField The element name of the field where the URL to navigate to is provided. The default value is NavigateUrl.
Target The browser window or frame that displays the content of the page linked.
UniqueID Obtains the unique, hierarchically qualified identifier for the AdRotator control.

The important events of the AdRotator class:

Events Description
AdCreated It is raised once per round trip to the server after creation of the control, but before the page is rendered
DataBinding Occurs when the server control binds to a data source.
DataBound Occurs after the server control binds to a data source.
Disposed Occurs when a server control is released from memory, which is the last stage of the server control lifecycle when an ASP.NET page is requested
Init Occurs when the server control is initialized, which is the first step in its lifecycle.
Load Occurs when the server control is loaded into the Page object.
PreRender Occurs after the Control object is loaded but prior to rendering.
Unload Occurs when the server control is unloaded from memory.

Working with AdRotator Control

Create a new web page and place an AdRotator control on it.


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