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Encoder Code 39 Extended in Font Note The code-behind members to be used in binding expressions must be either Public or Protected

Note The code-behind members to be used in binding expressions must be either Public or Protected
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in order to be accessible at the moment binding occurs.
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CHAPTER 5 DATA BINDING
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Formatting with the DataBinder Class
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If you need to format a value prior to displaying it, you can use a helper class that s provided in the System.Web.UI namespace, called DataBinder. This class contains a static method called Eval(), which receives an object, an expression, and (optionally) a format string. The object is used as the context in which to evaluate the expression, and the result of the evaluation is formatted using the last parameter, if specified. If you wanted to apply special formatting to a user s birth date, for example, you could use this: <asp:label id="lblBirth" runat="server" Text='<%# DataBinder.Eval(dsUser.Tables(0).Rows(0), _ "(DateOfBirth)", "{0:MMMM dd, yyyy}") %>'> </asp:label> Here, the first parameter to Eval() is the row to display the value from, and it is used as the context in which the second parameter is evaluated the result of retrieving the DateOfBirth field through the Row default property; that is, the default property for the row at index 0. If you were retrieving a direct property, you wouldn t need the parentheses. Note that you must obey VB rules when splitting lines. Finally, the format string is applied. Notice that this part of the expression includes double quotes. That s why single quotes surround the code that assigns the Text property value (Text='...'). You cannot replace quotes the other way around, because single quotes cannot be used to enclose strings in the VB language. You may have noticed that the default property of the DataRow object (the object accessed by dsUser.Tables(0).Rows(0)) receives a string. However, the code uses the opening parenthesis, followed directly by the column name and then the closing parenthesis, without quotes. This facility of the DataBinder class saves you a lot of duplicate quotes. The true value that would be used is as follows: DataBinder.Eval(dsUser.Tables(0).Rows(0), "(""DateOfBirth"")", "{0:MMMM dd, yyyy}") This relaxed syntax is valid only for the DataBinder.Eval() method, and it certainly makes the code more readable!
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Caution
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DataBinder makes pretty heavy use of reflection for its dynamic evaluation capabilities, which hinders performance. You may want to consider alternative ways of getting at the data, such as explicit simple data binding through methods or properties at the page level.
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Now let s see how this functionality can be useful in the Friends Reunion application.
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The Friends Reunion application is intended to allow users to get in touch with old friends. To handle this, when users make requests for fellow users to contact them, a record will be placed in the Contact table. This table has the following structure:
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CHAPTER 5 DATA BINDING
In order to respect the user s privacy, the site will never disclose a contact s details without approval. Therefore, when a new request for contact is placed in the Contact table, it will have its IsApproved flag set to 0, indicating that this is a request waiting to be approved. After the user has approved the contact, the IsApproved flag is updated, and the other user will be able to access the contact information. For example, say that you spot your old friend Victor listed at the Friends Reunion site, and he has said it s okay for you to contact him. You would then be given access to his personal information to arrange a meeting or whatever. In the following discussion, we ll focus on the view of the target user the one specified in the DestinationID, your friend Victor. Before the target user approves a contact that has placed a request, he will surely want to see that user s details; that is, Victor will want to make sure that you re really an old friend. To allow this verification, the application will use a form that receives a RequestID as a query string parameter and displays information about the user who is requesting contact (you, in this example) in a table, taking advantage of data binding. The form s code-behind page will include a method that counts the number of pending requests the user has, and use data binding to display this value, too. Finally, a button will allow Victor to update the IsApproved flag, and thus approve the contact. Once the flag has been updated, Victor will be redirected to the page he came from, which will be News.aspx. Try It Out: Display Information About Fellow Users Using Data Binding Eventually, the page you re about to create will arrive as a result of navigation from News.aspx, in the course of which the RequestID will be passed as a query string. For now, while testing this example, you ll assemble the string, but don t let that put you off we ll deal with News.aspx later. 1. Add a new web form called ViewUser.aspx to the project, adding the link to the iestyle.css stylesheet (you can drag-and-drop the file to the design surface as usual), and changing the code-behind page to inherit from the FriendsBase class. 2. Add a style rule called TableLines to the stylesheet. This will help to make the HTML tables look consistent across the site: .TableLines { border-bottom: #c7ccdc 1px solid; border-left: #c7ccdc 1px solid; border-right: #c7ccdc 1px solid; border-top: #c7ccdc 1px solid; padding: 5px 5px 5px 5px; }
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