Beginning Web Development, Silverlight, and ASP.NET AJAX

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30 CHAPTER 2 ■ BASICS OF WEB DEVELOPMENT WITH ASP.NET For the stock quote application you are creating, set the properties of the three controls as follows: TextBox: Change the ID to txtTicker. Button: Change the ID to btnGet, and change the text to Get. Label: Change the ID to lblQuote, and change the text to '' (an empty string). The page will now look something like what you see in Listing 2-1. Listing 2-1. The Stock Quote Application Untitled Page You can see the labels for the three controls as well as their attributes, which define the properties that you just set. If you don’t want to use the Property Editor to set the properties, you can instead use the source editor to enter these properties manually, and IntelliSense will even help you with this. If you haven’t done so already, make sure that you add a web reference to the XMethods quote service at www.swanandmokashi.com/HomePage/WebServices/StockQuotes. asmxWSDL. Call the service reference 'QS'.
CHAPTER 2 ■ BASICS OF WEB DEVELOPMENT WITH ASP.NET 31 Now, in the Default.aspx page’s Design view, double-click the button, and a click event handler will be added to the code-behind file. This event handler will be called btnGet_Click. Edit the event handler so that it looks like this: protected void btnGet_Click(object sender, EventArgs e) { QS.StockQuotes myQuote = new QS.StockQuotes(); QS.Quote[] res; res = myQuote.GetStockQuotes(txtTicker.Text); lblQuote.Text = res[0].StockQuote; } This code creates an instance of the web service proxy called 'MyQuote'. It then calls the getStockQuotes method on this proxy (and by extension the web service), which returns a stock quote for the string ticker. As you can see from the code, the contents of the txtTicker text box are being passed to the quote retrieval web service. The service returns an array of Quote objects, and the label then has its text set to the value of the StockQuote property of the first element in this array, converted to a string. Do note, however, that this is just example code. In a real scenario, you would likely want to at least add some form of error handling to check for a timeout or other error in calling the web service. For production systems, you may also want to look into asynchronous web service calls. Now if you run the application, type a stock ticker (e.g., MSFT, RTRSY, or BEAS) into the text box, and click Get, the web service will return a stock quote for that ticker. You can see this in action in Figure 2-21. Figure 2-21. The simple stock quote web site
Page 1: The EXPERT’s VOIce ® in .NET Beg
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Page 9 and 10: Contents About the Author . . . . .
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Page 17: About the Author ■LAURENCE MORONE
Page 21 and 22: Introduction This book is aimed at
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CHAPTER 6 Deploying Your Web Site I
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CHAPTER 7 .NET 3.0: Windows Communi
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234 CHAPTER 10 ■ .NET 3.0: PROGRA
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CHAPTER 11 Ajax Applications and Em
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CHAPTER 11 ■ AJAX APPLICATIONS AN
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CHAPTER 12 AJAX Extensions for ASP.
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CHAPTER 12 ■ AJAX EXTENSIONS FOR
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CHAPTER 13 Ajax Scripts and Service
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332 CHAPTER 14 ■ JAVASCRIPT PROGR
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CHAPTER 15 Enhancing the Web Experi
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376 CHAPTER 16 ■ PROGRAMMING SILV
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416 ■INDEX applications. See also
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Beginning Web Development, Silverlight, and ASP.NET AJAX

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