How to use adrotator control in ASP.Net?An adrotator
control is available in ASP.Net to ease the task of rotating the advertisement
images in a web form. This control enables you to display a different
image whenever you refresh the page. This adrotator control takes the
information about the images that are to be displayed from an XML file
which also have many other elements in it that are used by this control.
First let us have a look at a sample advertisement file that is used by
the adrotator control in ASP.Net.
Let us assume
that the advertisement XML file is named as advt.xml. This file might
look like, <Advertisements> The XML file
that is used for advertisements would have the root element as the <Advertisements>
element. This may have many <Ad> child elements. The elements <ImageUrl>,
<NavigateUrl>, <AlternateText>, <Impressions> and <Keyword>
are found in the <Ad> element. These elements identify the properties
of the image that is displayed using the adrotator control. The <ImageUrl>
element specifies the path to the image that is displayed using the AdRotator
control. Once a user clicks the image that is displayed the user is taken
to the URL specified in the <NavigateUrl> element. The <AlternateText>
element holds the text that is displayed when the image is not loaded.
The text in this element is also used as a ToolTip in some of the browsers.
The element <Impressions> has a number as a value. This number indicates
how often the image is displayed with respect to other images. The more
the value of the number in this element, the more is the frequency of
the image that is displayed. The sum of all the impressions in the advertisement
file should not exceed 2,047,999,999. Otherwise the AdRotator will throw
an runtime exception. The element <Keyword> is used to give the
category of the advertisement. You can just
drag and drop a AdRotator control in the webform and set its attributes
if you are using Visual Studio .Net. The code that is generated for the
AdRotator control might be something as given below: <asp:AdRotator
id="AdRotator1" In the above
code in the HTML file you could see that the AdvertisementFile attribute
of the AdRotator control has the xml file “advt.xml”. The other
attributes are ‘id’ and ‘Target’. During runtime the
AdRotator control uses the controls like <asp:HyperLink> and <asp:Image>
to display the image in the web form page. The size of the image that
is displayed is limited by the size of the AdRotator control that is found
in the page. So, if you want to display larger images you need to adjust
the size of the AdRotator control during design time itself. It is possible
to modify the values of the <ImageUrl>, <NavigateUrl> and
<AlternateText> programmatically. For this you can use the AdCreated
event. Thus by using the AdCreated event the rendering of the AdRotator
control can be controlled. <script
runat="server"> Using the
above script you can modify the NavigateUrl property programmatically.
This even is called in the AdRotator control as given below in the HTML
code for the web form. The OnAdCreated
property of the AdRotator control specifies the event that is called which
changes the url to be navigated. Thus the
AdRotator control is an easy way to display and rotate advertisements
and also to give preference to some advertisements by using the <Impressions>
element of the advertisement xml file.
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