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The client begins by instantiating a Web service proxy It then declares a string variable called SessionId and uses it to hold the returned session id from LogOn (try calling LogOn with a different password and watch the exception you ll get) To pass this session id back with subsequent requests, the client creates a new SessionHeader object and sets the wsSessionHeaderValue property It then sets the SessionId member of this new SessionHeader to the SessionId that was returned from LogOn From this point on, any calls to the Web service will automatically receive the SessionHeader SOAP header with the correct SessionId When finished calling the service, I call LogOff just to cleanup the session (this is not required but I m trying to be a good citizen) One thing you ll notice is that to call one method, ie GetCustomersDataSet, I had to call LogOn first then LogOff after that This is definitely significant overhead so you don t want to do it with every call Instead you should instantiate a Web service proxy and call LogOn when the application starts then cache this instance of the proxy for use throughout the application You would also need to handle the situation where the session expires (because the user went to get coffee) so you d have to LogOn again If your client is an ASPNET application, it can store the session id it gets from LogOn in the ASPNET data cache or in the Application cache

private StringNode(

The Microsoft AJAX Library communication architecture builds on a layered approach, just like the ASPNET 20 AJAX Extensions communication architecture, to provide various services to the client as it integrates with the server The diagram in Figure 84 shows the different layers that make up the communication stack on the client The service proxy layer provides a browser-independent way to access web services, application services, and page methods The serialization layer provides support for converting JavaScript types to and from JSON And web request core components provide the underlying support that makes all this happen

StringBuffer textBuffer, int textBegin, int textEnd, boolean shouldDecode) {

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Now that you know how to create typed DataSets, let s look at a Web service and a Windows Forms client that use typed DataSets to send data back and forth over the Internet Listing 9-7 shows a Web method called SaveCustomerOrdersTypedDataSet which receives a DataSet, uses it to update the Customers and Orders tables, then returns the refreshed DataSet This method complements the GetCustomerOrdersTypedDataSet method in listing 9-4 Listing 9-7 A method to save changes to the database (VBWSBook\9\CustomerOrdersasmx)

Service Proxies (WCF, Application Services, Page Methods)

this(textBuffer, textBegin, textEnd);

<WebMethod()> _ Public Function SaveCustomerOrdersTypedDataSet( _ ByVal ds As CustomerOrdersDataSet) _ As CustomerOrdersDataSet Dim Sql1 As String = "SELECT CustomerID, CompanyName FROM Customers" Dim Sql2 As String = "SELECT * FROM Orders"

WebRequest Core (WebRequestManager, XmlHttpExecutor, XmlHttp)

setShouldDecode(shouldDecode);

public static Node createStringNode( StringBuffer textBuffer, int textBegin, int textEnd, boolean shouldDecode) { if (shouldDecode) return new DecodingNode(textBuffer, textBegin, textEnd); return new StringNode(textBuffer, textBegin, textEnd); }

Dim ConnStr As String = _ ConfigurationSettingsAppSettingsGet("ConnStr") Dim cn As New SqlConnection(ConnStr) Try cnOpen() Dim da1 As New SqlDataAdapter(Sql1, cn) Dim da2 As New SqlDataAdapter(Sql2, cn)

With Figure 84 as our guide, let s take a look at the various layers and their respective components with a goal of understanding service proxies, JSON serialization, and the web request core components that comprise the client communication stack

private void setShouldDecode(boolean shouldDecode) {

Service Proxies The Microsoft AJAX Library provides proxy services for WCF, application services, and page methods, providing functionality for the client to call into all these server-side services in a browser-independent way In this section, we explore how these proxy services work and how to interact with them

Dim cb1 As New SqlCommandBuilder(da1) Dim cb2 As New SqlCommandBuilder(da2) da1Update(ds, "Customers") da2Update(ds, "Orders") cnClose() Catch ex As Exception DebugWriteLine(exMessage) Throw New Exception(exMessage) Finally cnDispose() End Try Return ds End Function

thisshouldDecode = shouldDecode;

.

To update a database from a DataSet, you need to create a SqlDataAdapter (or an OleDbDataAdapter) for each database table that you want to update You then have to create Select, Update, Insert, and Delete commands for the adapter When there s a one-to-one correspondance between tables in your DataSet and database tables, you can create just the Select command then use a SqlCommandBuilder which builds the remaining commands for you After you ve created the data adapters, you call Update on each adapter passing it the DataSet and the name of the table to update In addition to updating the database table, the adapter will also refresh the DataSet with the current database table s content After updating both Customers and Orders tables, SaveCustomerOrdersTypedDataSet returns the refreshed DataSet This is not necessary unless clients need to display the current content of the database which is usually the case Listing 9-8 shows an example Windows Forms client code

protected boolean shouldDecode() {

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