Listview Asp.net 3.5

ASP.NET version 3.5 added two new data Web controls to the Toolbox: the ListView and DataPager. As discussed in the first installment of this article series, Displaying Data with the ListView, the ListView control offers the same built-in features found in the GridView, but much finer control over the rendered output. The ListView's output is defined using a variety of templates, and we looked at examples using the control's LayoutTemplate and ItemTemplates. In particular, these examples used a LayoutTemplate that included a placeholder for the ItemTemplate's rendered output.

The ItemTemplate is rendered for each record bound to the ListView control, and is typically referenced in the LayoutTemplate. This approach generates the rendered markup defined in the LayoutTemplate, plus the rendered markup created by the ItemTemplate for each record. This works fine for simple rendering scenarios, but in more complex scenarios we may need to render different formatting markup for different groups of records. For example, imagine that we needed to display a set of records in a three-column HTML <table>. For each record we would want to emit a table cell (<td>), but for every three records we would need to emit a new table row (<tr>). Such customizations can be accomplished declaratively with the ListView control's includes GroupTemplate and GroupItemCount properties.

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