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The GridView is the successor to the DataGrid control and provides its same set of basic capabilities, plus a long list of extensions and improvements. As mentioned, the DataGrid which is still fully supported in ASP.NET is an extremely powerful and versatile control. However, it has one big drawback: it requires you to write a lot of custom code, even to handle relatively simple and common operations such as paging, sorting, editing, or deleting data. The GridView control was designed to work around this limitation and make two-way data binding happen with as little code as possible. The control is tightly coupled to the family of new data source controls, and it can handle direct data source updates as long as the underlying data source object supports these capabilities. This virtually codeless two-way data binding is by far the most notable feature of the new GridView control, but other enhancements are numerous. The GridView control is an improvement over the DataGrid control also because it has the ability to define multiple primary key fields, new column types, and style and templating options. The GridView also has an extended eventing model that allows you to handle or cancel events such as inserting, deleting, updating, paging, and more.

cn.Open() Open the connection explicitly. da.Update(ds, Publishers ) da2.Update(ds, Authors ) cn.Close() Close the connection explicitly.

The ListView control is fully template-based and allows you to control all aspects of the user interface via templates and properties. ListView operates in a way that closely resembles the behavior of existing data-bound controls, such as FormView or DataList. However, unlike these controls, the ListView control never creates any user-interface layout on its own. Every markup tag that the control emits is entirely under the developer s control, including header, footer, body, item, selected item, and so on.

The ListView control binds to any data source control and executes its set of data operations. It can page, update, insert, and delete data items in the underlying data source as long as the data source supports these operations. In most cases, no code is required to set up any of these operations. If code is required, you can also explicitly bind data to the control using the more traditional DataSource property and related DataBind method. The rendering capabilities of the ListView control make it suitable for publishing scenarios where a read-only, but compelling, user interface is needed. The control also works great in editing scenarios even though it lacks some advanced features such as input validation or made-to-measure edit templates for particular types of data or foreign keys. I ll say more on the ListView control in 11.

A last tip: you can query the DataSet s HasChanges property to detect whether it con tains one or more DataTable objects with modified rows. If this property returns True, you can use the GetChanges method to build a second DataSet that contains only the rows that are actually modified and then update only those tables whose Rows collec tion contains elements:

10

As you might have figured out, most of the differences between the various data-bound controls is in how they use custom templates. A template is a piece of markup that the control injects in the page at a very specific point. More interestingly, the template contains bindable elements, which are placeholder markup elements whose content is determined by bound data. How would you define the content of such bindable elements In ASP.NET, a special syntax is required that we ll examine right away. After this, we ll return to the two most widely used view controls and examine some of their advanced capabilities.

If ds.HasChanges Then Build another DataSet that contains only modified rows. Dim ds2 As DataSet = ds.GetChanges() Update each data table individually. For Each dt As DataTable In ds2.Tables If dt.Rows.Count > 0 Then This table contains modified rows. Debug.WriteLine( Updating table & dt.TableName) Proceed with the update operation. End If Next End If

A data-binding expression is any executable code wrapped by <% %> and prefixed by the symbol #. Typically, you use data-binding expressions to set the value of an attribute in the opening tag of a server control. A data-binding expression is programmatically managed via an instance of the DataBoundLiteralControl class. Note The binding expression is really any executable code that can be evaluated at run time. Its

You can achieve the same result in other ways as well. For example, you can use the DataTable s GetChanges method to retrieve the modified rows in a table. You can also pass an argument to both the DataSet s GetChanges method and the DataTable s GetChanges method to retrieve only the rows that have been added, deleted, or modified:

purpose is to generate data that the control can use to bind for display or editing. Typically, the code retrieves data from the data source, but there is no requirement that this be the case. Any executable code is acceptable as long as it returns data for binding. A data-binding expression is evaluated only when something happens that fires the control s DataBinding event.

Check whether there are deleted rows in the Publishers table. Dim dt2 As DataTable = _ ds.Tables( Publishers ).GetChanges(DataRowState.Deleted) GetChanges returns Nothing if no row is modified. If Not (dt2 Is Nothing) AndAlso dt2.Rows.Count > 0 Then Process deleted rows in the Publishers table. End If