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The target namespace of the web service (http://localhost/demo). The URL where the service exists (http://localhost/service.php). In non-WSDL mode, can be used to provide the document style. In non-WSDL mode, can be used to define the document use. The SOAP version to use. Use the constant SOAP_1_1 or SOAP_1_2. HTTP authentication login. HTTP authentication password. The host of a proxy to connect through. The proxy port. The proxy login. The proxy password. Used in SSL authentication (covered in 21). The password for the SSL key provided by local_cert. Enables the compression of SOAP requests. There are various constants defining different SOAP compression techniques, including SOAP_COMPRESSION_ACCEPT, SOAP_COMPRESSION_GZIP, and SOAP_COMPRESSION_DEFLATE. Defines the internal character encoding. Will convert received strings into the provided encoding. Maps WSDL types to PHP classes. The format of this parameter is an associative array with WSDL types as keys and class names as values (covered in 20). Enables or disables the tracing of SOAP requests. See Listing 19-7. Enables or disables the throwing of exceptions when a SoapFault condition is met. Number of seconds to wait for a connection to the SOAP service.

Tip If you want some help creating your connection string, select the SqlDataSource, open the Properties

Repeated-value data binding allows you to display an entire table (or just a single field from a table). Unlike single-value data binding, this type of data binding requires a special control that supports it. Typically, this will be a list control such as CheckBoxList or ListBox, but it can also be a much more sophisticated control such as the GridView (which is described in 17). You ll know that a control supports repeated-value data binding if it provides a DataSource property. As with single-value binding, repeated-value binding doesn t necessarily need to use data from a database, and it doesn t have to use the ADO.NET objects. For example, you can use repeated-value binding to bind data from a collection or an array.

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window, and select the ConnectionString property. A drop-down arrow will appear at the right side of the value. If you click that drop-down arrow, you ll see a list of all the connection strings in your web.config file. You can pick one of these connections, or you can choose New Connection (at the bottom of the list) to open the Add Connection dialog box, where you can pick the database you want. Best of all, if you create a new connection Visual Studio copies the connection string into your web.config file, so you can reuse it with other SqlDataSource objects.

Data binding works a little differently depending on whether you re using single-value or repeated-value binding. To use single-value binding, you must insert a data binding expression into the markup in the .aspx file (not the code-behind file). To use repeated-value binding, you must set one or more properties of a data control. Typically, you ll perform this initialization when the Page.Load event fires. You ll see examples of both these techniques later in this chapter. Once you specify data binding, you need to activate it. You accomplish this task by calling the DataBind() method. The DataBind() method is a basic piece of functionality supplied in the Control class. It automatically binds a control and any child controls that it contains. With repeated-value binding, you can use the DataBind() method of the specific list control you re using. Alternatively, you can bind the whole page at once by calling the DataBind() method of the current Page object. Once you call this method, all the data binding expressions in the page are evaluated and replaced with the specified value. Typically, you call the DataBind() method in the Page.Load event handler. If you forget to use it, ASP.NET will ignore your data binding expressions, and the client will receive a page that contains empty values.

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