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In 7, when we looked at table binding, you saw that ASP.NET 2.0 added a shorthand method of binding data from the data source to the Web control. The Eval() method gives you easy access to the columns from the data source: <%# Eval("[ManufacturerWebsite]") %> And if you need to format the value from the column, you can add a format string to the Eval() method as well: <%# Eval("[ManufacturerEmail]", "mailto:{0}") %> The Eval() method is fine when all you want to do is show the column. But when you want to allow inline editing, the Eval() method doesn t work. ASP.NET 2.0 introduces a new method, Bind(), that allows data to flow both ways: from the database to populate the Web control, and then back from the Web control when its value is required to send to the database. It has the same two overloads as the Eval() method. If you want to retrieve the column as it is, you specify the column name: <%# Bind("[ManufacturerWebsite]") %> And if you want to format the column, you specify a format string as well: <%# Bind("[ManufacturerEmail]", "mailto:{0}") %> You should use the method that is most appropriate. When the column is read-only, use the Eval() method. For example, in an ItemTemplate or AlternatingItemTemplate you should use Eval(), as the data will be read-only. If the column is read-write, use the Bind() method. For example, in an EditItemTemplate or an InsertItemTemplate for a column that is to be updated, use the Bind() method. If the column is not going to be updated, use the Eval() method.

In this chapter, we looked at some of the other web development techniques that are used to develop Web 2.0 applications. Specifically, we implemented a tagging system, we provided web feeds of our data using Atom, and we used microformats to mark up data on our web site in a standardized manner. We implemented the rel-tag and hCard microformats on our web site, first by using reltag with the tags system we created at the start of the chapter and then by allowing users to create a public profile. In the coming chapters, we will look at other available microformats, including geo and hCalendar. In the next chapter, we will implement a dynamic image gallery on our blog.

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protected void cmdLoad_Click(Object sender, EventArgs e) { // Restore contents of member variable to text box. txtValue.Text = contents; } } The logic in the Load and PreRender event handlers allows the rest of your code to work more or less as it would in a desktop application. However, you must be careful not to store needless amounts of information when using this technique. If you store unnecessary information in view state, it will enlarge the size of the final page output and can thus slow down page transmission times. Another disadvantage with this approach is that it hides the lowlevel reality that every piece of data must be explicitly saved and restored. When you hide this reality, it s more likely that you ll forget to respect it and design for it. If you decide to use this approach to save member variables in view state, use it exclusively. In other words, refrain from saving some view state variables at the PreRender stage and others in control event handlers, because this is sure to confuse you and any other programmer who looks at your code.

As you learned in 7, all table-binding Web controls can use the Eval() method. However, a couple of restrictions apply to using the Bind() method: Only the GridView, DetailsView, and FormView support the Bind() method. You can use the Bind() method only if the data source is specified using the DataSourceID property; that is, if you re using a SqlDataSource to query the database. The examples in this chapter follow both these rules, so you ll be able to use the Bind() method without any problems.

s The previous code example reacts to the Page.PreRender event, which occurs just after page proTip

o far, the web application we have developed restricts users to only publishing text-based information in their blogs While we have allowed users a degree of control by permitting a limited subset of HTML to be used (including the use of the <img> tag), users are still unable to upload their own images In this chapter, we will extend the functionality of our blogging system to allow users to upload one or more photos to each of their blog posts While this may sound like a fairly trivial process, there are a number of different issues to consider, such as these: Storage of images We must store the images on the server and link them to blog posts Sending images to browsers When a user views posts with images in them, we must send the images.

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