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WSDL documents are no more difficult to write than HTML documents; they just follow a different syntax that tends to be a little less concise WSDL is designed to be really extensible, so a lot of the concepts will seem to overlap, but each does actually have a slightly different purpose The following are some WSDL terms that you can expect to encounter when you re working with web services Just as you know what divs and spans are, you ll want to recognize these WSDL equivalents of common tags Types: These represent a format of data, like a string or an integer, or even an object with properties There are built-in types for most things like integers and strings, and these are inherited from the XML Schema Definition (XSD) language In the next chapter, you will learn how to create complex types that represent custom objects.

Note This example shows how ADO.NET works to retrieve a simple result set. Of course, ADO.NET also provides handy controls that go beyond this generic level and let you provide full-featured grids with sorting and editing. These controls are described in 16 and 17. For now, you should concentrate on understanding the fundamentals about ADO.NET and how it works with data.

This process is the same whether you re using the ListBox, the DropDownList, the CheckBoxList, the RadioButtonList, or even the HtmlSelect control. All these controls provide the same properties and work the same way. The only difference is in the way they appear on the final web page.

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To try this type of data binding, add a ListBox control to a new web page. Next, import the System.Collections namespace in your code. Finally, use the Page.Load event handler to create an ArrayList collection to use as a data source as follows: ArrayList fruit = new ArrayList(); fruit.Add("Kiwi"); fruit.Add("Pear"); fruit.Add("Mango"); fruit.Add("Blueberry"); fruit.Add("Apricot"); fruit.Add("Banana"); fruit.Add("Peach"); fruit.Add("Plum"); Now, you can link this collection to the ListBox control: lstItems.DataSource = fruit; Because an ArrayList is a straightforward, unstructured type of object, this is all the information you need to set. If you were using a DataTable (which has more than one field) or a DataSet (which has more than one DataTable), you would have to specify additional information. To activate the binding, use the DataBind() method: this.DataBind(); You could also use lstItems.DataBind() to bind just the ListBox control. Figure 15-5 shows the resulting web page.

Now that you understand how to retrieve data, it isn t much more complicated to perform simple delete and update operations. Once again, you use the Command object, but this time you don t need a DataReader because no results will be retrieved. You also don t use a SQL Select command. Instead, you use one of three new SQL commands: Update, Insert, or Delete.

This technique can save quite a few lines of code. This example doesn t offer a lot of savings because the collection is created just before it s displayed. In a more realistic application, however, you might be using a function that returns a ready-made collection to you: ArrayList fruit; fruit = GetFruitsInSeason("Summer"); In this case, it s extremely simple to add the extra two lines needed to bind and display the collection in the window: lstItems.DataSource = fruit; this.DataBind(); or you could even change it to the following, even more compact, code: lstItems.DataSource = GetFruitsInSeason("Summer"); this.DataBind(); On the other hand, consider the extra trouble you would have to go through if you didn t use data binding. This type of savings compounds rapidly, especially when you start combining data binding with multiple controls, advanced objects such as DataSets, or advanced controls that apply formatting through templates.

To execute an Update, an Insert, or a Delete statement, you need to create a Command object. You can then execute the command with the ExecuteNonQuery() method. This method returns the number of rows that were affected, which allows you to check your assumptions. For example, if you attempt to update or delete a record and are informed that no records were affected, you probably have an error in your Where clause that is preventing any records from being selected. (If, on the other hand, your SQL command has a syntax error or attempts to retrieve information from a nonexistent table, an exception will occur.)

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