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StockQuoteExternalService is a simple Web service that provides a single Web method for requesting stock quotes (RequestQuoteExt), and it returns its own equivalent to the StockTraderTypes.Quote type, which is named QuoteExt. The Quote and QuoteExt types are equivalent, but they differ from each other in three ways: 1. The QuoteExt type conforms to a different qualified namespace from the Quote type. Each type conforms to its own XSD schema file. 2. The QuoteExt type does not contain equivalents to the Quote type s Change and Percent_Change properties. 3. The QuoteExt type provides a time stamp property named DateTime_Ext, which is of type System.DateTime. The Quote type provides an equivalent time stamp property named DateTime that is of type String. These are admittedly minor differences, but they illustrate the point. When you call an external service, it is unlikely that their type definitions will be equivalent to yours. You have to be prepared for some manual work to translate the differences. In real life, of course, you would not have to create the external service yourself, but for the purposes of this demonstration you do.

But suppose you need additional AJAX functionality in your content page. For example, you might want to take advantage of one of many great controls available in the ASP.NET AJAX Control Toolkit (covered extensively in s 7 and 8). These controls require additional scripts that may not have been included in the master page. That is precisely where the ScriptManagerProxy control comes in. Without getting into discussions about the ASP.NET AJAX Control Toolkit, we ll add one of its controls, the DragPanelExtender, to the content page with the help of the ScriptManagerProxy control. To do this, drag and drop a ScriptManagerProxy control, followed by a Label control, and a DragPanelExtender (from the AJAX Control Toolkit) onto the page. Set the text property of the Label control to some text such as You can drag and drop this label. At this point, your page should look similar to Figure 5-3 with the following code:

using System; using System.Web.Services; using System.Web.Services.Description; using System.Web.Services.Protocols; using System.Xml.Serialization; namespace StockTrader { public abstract class StockTraderStub : System.Web.Services.WebService { public abstract Quote RequestQuote(string Symbol); } [XmlTypeAttribute(Namespace= "http://www.bluestonepartners.com/schemas/StockTrader/")] public class Quote { public string Symbol; public string Company; public string DateTime; public System.Double High; public System.Double Low; public System.Double Open; public System.Double Last; public System.Double Change; public System.Double PercentChange; public System.Double Previous_Close; public System.Double High_52_Week; public System.Double Low_52_Week; } }

Notice the following important points: The definition file includes one stub class that encapsulates all operations, and then any number of additional classes for the data types.

<%@ Page Language="C#" MasterPageFile="~/MasterPage.Master" AutoEventWireup="true" CodeBehind="ContentPage.aspx.cs" Inherits="Ajax.ContentPage" Title="DragPanelExtender Demo" %> <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %> <asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="server"> <asp:ScriptManagerProxy ID="ScriptManagerProxy1" runat="server"> </asp:ScriptManagerProxy> <cc1:DragPanelExtender ID="DragPanelExtender1" runat="server" EnableViewState= "False" TargetControlID="Label1"> </cc1:DragPanelExtender>   <asp:Label ID="Label1" runat="server" Text="You can drag and drop this label."> </asp:Label> </asp:Content>

The Service Agent (StockTraderServiceAgent)

3

The last step before running the page is to set the TargetControlID property of the DragPanelExtender to the name of the Label control (i.e., Label1). When you run the page, you can drag and drop the actual label throughout the page as shown in Figure 5-4.

The service agent implements the same interface and type definitions as the business assembly by referencing the StockTraderTypes assembly (as shown in Figure 4-6). The service agent also includes a proxy class for the StockQuoteExternalService external Web service. Listing 4-9 shows the code listing for the service agent, including the complete listing for its RequestQuote method.

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