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message or an error page. This design is unavoidable if the SqlDataSource suppressed exceptions, it could hide potential problems and make debugging extremely difficult. However, it s a good idea to handle the problem in your web page and show a more suitable error message. To do this, you need to handle the data source event that occurs immediately after the error. If you re performing a query, that s the Selected event. If you re performing an update, delete, or insert operation, you would handle the Updated, Deleted, or Inserted event instead. (If you don t want to offer customized error messages, you could handle all these events with the same event handler.) In the event handler, you can access the exception object through the SqlDataSourceStatusEventArgs.Exception property. If you want to prevent the error from spreading any further, simply set the SqlDataSourceStatusEventArgs.ExceptionHandled property to true. Then, make sure you show an appropriate error message on your web page to inform the user that the command was not completed. Here s an example: protected void sourceProducts_Selected(object sender, SqlDataSourceStatusEventArgs e) { if (e.Exception != null) { lblError.Text = "An exception occurred performing the query."; // Consider the error handled. e.ExceptionHandled = true; } }

range of parameters while centralizing functionality under common names. Even the methods you ve seen so far (such as the string methods for padding or replacing text) have multiple versions that provide similar features with various options.

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Selecting data is only half the equation. The SqlDataSource can also apply changes. The only catch is that not all controls support updating. For example, the humble ListBox doesn t provide any way for the user to edit values, delete existing items, or insert new ones. Fortunately, ASP.NET s rich data controls including the GridView, DetailsView, and FormView all have editing features you can switch on. Before you can switch on the editing features in a given control, you need to define suitable commands for the operations you want to perform in your data source. That means supplying commands for inserting (InsertCommand), deleting (DeleteCommand), and updating (UpdateCommand). If you know you will allow the user to perform only certain operations (such as updates) but not others (such as insertions and deletions), you can safely omit the commands you don t need. You define the InsertCommand, DeleteCommand, and UpdateCommand in the same way you define the command for the SelectCommand property by using a parameterized query. For example, here s a revised version of the SqlDataSource for product information that defines a basic update command to update every field: <asp:SqlDataSource ID="sourceProductDetails" runat="server" ProviderName="System.Data.SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="SELECT ProductID, ProductName, UnitPrice, UnitsInStock, UnitsOnOrder, ReorderLevel, Discontinued FROM Products WHERE ProductID=@ProductID" UpdateCommand="UPDATE Products SET ProductName=@ProductName, UnitPrice=@UnitPrice, UnitsInStock=@UnitsInStock, UnitsOnOrder=@UnitsOnOrder, ReorderLevel=@ReorderLevel, Discontinued=@Discontinued WHERE ProductID=@ProductID"> <SelectParameters>

Construction of a SOAP server allows you to define the WSDL the service represents and assign various options for the service. SoapServer::__construct(mixed $wsdl [, array $options]) If you pass null to the $wsdl parameter, you are then required to set the uri option. Table 19-3 shows the SoapServer::__construct() options.

Delegates allow you to create a variable that points to a method You can use this variable at any time to invoke the method Delegates help you write flexible code that can be reused in many situations They re also the basis for events, an important NET concept that you ll consider in the next chapter The first step when using a delegate is to define its signature The signature is a combination of several pieces of information about a method: its return type, the number of parameters it has, and the data type of each parameter A delegate variable can point only to a method that matches its specific signature In other words, the method must have the same return type, the same number of parameters, and the same data type for each parameter as the delegate.

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