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You must be careful with the configuration, naming, and location of the advertise ment file to assure that you don t cause security vulnerabilities. Listed below are some guidelines for this file: 1. Locate the advertisement file in the App_Data folder because ASP.NET does not allow browsers to request files in this folder. 2. Use a file extension, such as .config, that ASP.NET does not allow a browser to request. 3. Set permissions on the advertisement file to allow the ASP.NET account to have read-only access. 4. The ad file is not validated by the AdRotator control, so always check the data to assure that it does not contain malicious scripts before the data is released to production.
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Lesson 2: Working with Data-Bound Web Server Controls
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The Impressions element controls the frequency of advertisement display. A higher number increases the frequency relative to other advertisements in the file. In this example, a Web page was created and an AdRotator control was added to the page. The advertisement file contains ad entries for Adventure Works, Contoso, and Northwind Traders. Listed below is the XML file, which was placed into the App_Data folder.
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Sample Ads.config XML File
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< xml version="1.0" encoding="utf-8" > <Advertisements xmlns="http://schemas.microsoft.com/AspNet/AdRotator-Advertisement-File-1.2"> <Ad xmlns="">
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<Keyword>AdventureWorks</Keyword>
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<ImageUrl>~/images/AdventureWorks.gif</ImageUrl>
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<NavigateUrl>http://www.adventure-works.com</NavigateUrl>
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<AlternateText>Ad for Adventure Works Web site</AlternateText>
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<Impressions>100</Impressions>
</Ad> <Ad xmlns="">
<Keyword>Contoso</Keyword>
<ImageUrl>~/images/Contoso.gif</ImageUrl>
<NavigateUrl>http://www.contoso.com/</NavigateUrl>
<AlternateText>Ad for Contoso Ltd. Web site</AlternateText>
<Impressions>100</Impressions>
</Ad> <Ad xmlns="">
<Keyword>Northwind</Keyword>
<ImageUrl>~/images/NorthwindTraders.gif</ImageUrl>
<NavigateUrl>http://http://www.northwindtraders.com</NavigateUrl>
<AlternateText>Ad for Northwind Traders Web site</AlternateText>
<Impressions>50</Impressions>
</Ad> </Advertisements>
Next, full banner images (468 pixels wide by 60 pixels high) were added to the Images folder for Adventure Works, Contoso, and Northwind Traders, and the follow ing code was added to the code-behind page to configure that AdRotator control:
'VB Partial Class AdRotator_Control Inherits System.Web.UI.Page Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles Me.Load
AdRotator1.AdvertisementFile = "~/App_Data/Ads.config"
AdRotator1.Height = 60
3
Exploring Specialized Server Controls
AdRotator1.Width = 468
End Sub
End Class
//C# using using using using using using using using using using
System;
System.Data;
System.Configuration;
System.Collections;
System.Web;
System.Web.Security;
System.Web.UI;
System.Web.UI.WebControls;
System.Web.UI.WebControls.WebParts;
System.Web.UI.HtmlControls;
public partial class AdRotator_Control : System.Web.UI.Page {
protected void Page_Load(object sender, EventArgs e)
AdRotator1.AdvertisementFile = "~/App_Data/Ads.config";
AdRotator1.Height = 60;
AdRotator1.Width = 468;
When this Web page is displayed, one of the advertisements is displayed, as shown in Figure 3-37.
Figure 3-37 The rendered AdRotator displays an advertisement.
The CompositeDataBoundControl Control
The CompositeDataBoundControl control serves as a base class for controls that con tain other data-bound controls. The most significant aspect of this class is that it implements the INamingContainer interface, which means that an inheritor of this
Lesson 2: Working with Data-Bound Web Server Controls
class is a naming container for its child controls. The classes that inherit from CompositeDataBoundControl are FormsView, DetailsView, and GridView, as shown in Figure 3-38. These controls are introduced in this lesson and will be further discussed as they are used with ADO.NET in 4, Using ADO.NET and XML with ASP.NET.
CompositeDataBoundControl MustInherit Class DataBoundControl Properties Controls
INamingContainer
DetailsView Class CompositeDataBoundControl
GridView Class CompositeDataBoundControl
FormView Class CompositeDataBoundControl
Figure 3-38 The CompositeDataBoundControl class hierarchy.
The GridView Control
The GridView control is used to display data in a tabular, rows-and-columns format. The GridView renders in the browser as an HTML table. The GridView control makes it easy to configure features such as paging, sorting, and editing without having to write much, if any, code. The GridView class hierarchy is shown in Figure 3-39.
NOTE
.NET 2.0
The GridView is new in ASP.NET version 2.0.
3
Exploring Specialized Server Controls
WebControl Class Control
GridView Class
IPostBackContainer IPostBackEventHandler ICallbackContainer ICallbackEventHandler
CompositeDataBoundControl Properties
AllowPaging AllowSorting AlternatingRowStyle AutoGenerateColumns AutoGenerateDeleteButton AutoGenerateEditButton AutoGenerateSelectButton BackImageUrl BottomPagerRow Caption CaptionAlign CellPadding CellSpacing DataKeyNames DataKeys EditIndex EditRowStyle EmptyDataRowStyle EmptyDataTemplate EmptyDataText EnableSortingAndPagingCallbacks FooterRow FooterStyle GridLines HeaderRow HeaderStyle HorizontalAlign PageCount PageIndex PagerSettings PagerStyle PagerTemplate PageSize RowHeaderColumn RowStyle SelectedDataKey SelectedIndex SelectedRow SelectedRowStyle SelectedValue ShowFooter ShowHeader SortDirection SortExpression TagKey TopPagerRow UseAccessibleHeader
BaseDataBoundControl Abstract Class WebControl
DataBoundControl Abstract Class BaseDataBoundControl
CompositeDataBoundControl Abstract Class DataBoundControl
DataControlField Abstract Class
Properties
AccessibleHeaderText Control ControlStyle DesignMode FooterStyle FooterText HeaderImageUrl HeaderStyle HeaderText InsertVisible IsTrackingViewState ItemStyle ShowHeader SortExpression ViewState Visible
IStateManager IDataSourceViewSchemaAccessor
Columns
Methods
ExtractValuesFromCell Initialize InitializeCell ToString ValidateSupportsCallback
Methods
DataBind DeleteRow GridView IsBindableType Sort UpdateRow
Events
GridViewRow Class TableRow
Properties
DataItem DataItemIndex RowIndex RowState RowType
IDataItemContainer INamingContainer
Rows
Methods
GridViewRow
PageIndexChanged PageIndexChanging RowCancelingEdit RowCommand RowCreated RowDataBound RowDeleted RowDeleting RowEditing RowUpdated RowUpdating SelectedIndexChanged SelectedIndexChanging Sorted Sorting
Figure 3-39 The GridView class hierarchy.
Lesson 2: Working with Data-Bound Web Server Controls
The basic structure of the GridView is shown in Figure 3-40. The GridView control con sists of a collection of GridViewRow (row) objects and a collection of DataControlField (column) objects. The GridViewRow object inherits from the TableRow object, which contains the Cells property, which is a collection of DataControlFieldCell objects.
GridView Structure Row = GridViewRow Column = DataControlField Cell = DataControlFieldCell Column Row Cells Row Cells Rows Row Cells Row Cells Cell Cell Cell Cell Cell Cell Cell Cell
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