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Figure 2.1 The Stock Quote application
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2002, Microsoft Smartphone, and any device that runs Windows CE.NET, such as the new Windows-based PDAs. The Compact Framework utilizes much of the same programming model as .NET Windows Forms applications, which means that you can just as easily write applications using the .NET Compact Framework as you can with the full-blown .NET Framework. The Compact Framework includes about 25 percent of the .NET Framework classes and is designed to run on a mobile device. When an application runs on a mobile device using the .NET Compact Framework, it gets compiled to native code for that device because the device has a version of the Common Language Runtime (CLR) running locally. This is not the case with Embedded Visual Basic; the code is interpreted. One of the key features of the Compact Framework is that it was designed from the ground up to support web services. This is important to remember because it means that your networked mobile devices can communicate with many different systems by using common web service protocols which opens up lots of functionality to you as a mobile developer, no matter which platform you re using. For example, if you have web services written on the Java platform, your .NET Compact Framework applications can take full advantage of them. Another key is that unlike most PDA programming models in the past, the .NET Compact Framework has a built-in security model. This model follows the same evidence-based security model as .NET desktop applications. One of the problems with other mobile technologies is that there is no defined security model. Developers 16
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Adding a web reference to the Stock Quote web service
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end up having to write their own methods for security, which can vary drastically from application to application. Let s take a quick look at a simple .NET Compact Framework application. This application utilizes a web service that is hosted by Nexus6Studio.com and allows you to search for stock quotes by providing a company s ticker symbol. In figure 2.1, our example application displays stock symbols. As you can see, all that is required from the user is a valid stock symbol to return data from the web service. Figure 2.2 demonstrates adding a web reference to the stock quote web service. As you can see by the browser window, the services provide us with two methods: GetQuickQuote and GetDetailQuote. Both methods require a ticker symbol as a single input parameter. The GetQuickQuote method returns the price only as a string object, and GetDetailQuote returns a custom data type in the form of a structure called DetailQuote. Once our references have been set, we can easily use the services (listing 2.1).
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Listing 2.1 Using the Nexus6Studio.com stock ticker web service
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'VB.NET Private Sub cmdGetQuote_Click(ByVal sender As System.Object, ByVal e _ As System.EventArgs) Handles cmdGetQuote.Click Dim oWS As New Nexus6StudioStockQuoteWebService If optDetailedQuote.Checked Then
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Dim q As DetailQuote q = oWS.GetDetailQuote(txtTicker.Text.Trim.ToUpper) With q lblPriceVal.Text = .Price lblChangePtsVal.Text = .Change_Points lblChangePctVal.Text = .Change_Percent.Replace("""", _ String.Empty) lblOpenVal.Text = .Open lblHighVal.Text = .High lblLowVal.Text = .Low lblBidVal.Text = .Bid lblAskVal.Text = .Ask lblVolumeVal.Text = .Volume End With Else lblPriceVal.Text = _ oWS.GetQuickQuote(txtTicker.Text.Trim.ToUpper) lblChangePtsVal.Text = "N/A" lblChangePctVal.Text = "N/A" lblOpenVal.Text = "N/A" lblHighVal.Text = "N/A" lblLowVal.Text = "N/A" lblBidVal.Text = "N/A" lblAskVal.Text = "N/A" lblVolumeVal.Text = "N/A" End If End Sub //C# private void cmdGetQuote_Click(object sender, System.EventArgs e) { Nexus6StudioStockQuoteWebService oWS = new Nexus6StudioStockQuoteWebService(); if(optDetailedQuote.Checked == true) { DetailQuote q; q = oWS.GetDetailQuote(txtTicker.Text.Trim().ToUpper()); lblPriceVal.Text = q.Price; lblChangePtsVal.Text = q.Change_Points; lblChangePctVal.Text = q.Change_Percent.Replace("\"", String.Empty); lblOpenVal.Text = q.Open; lblHighVal.Text = q.High; lblLowVal.Text = q.Low; lblBidVal.Text = q.Bid; lblAskVal.Text = q.Ask; lblVolumeVal.Text = q.Volume; } else { lblPriceVal.Text = oWS.GetQuickQuote(txtTicker.Text.Trim().ToUpper());
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THE .NET FRAMEWORK, VERSION 1.1
lblChangePtsVal.Text = "N/A"; lblChangePctVal.Text = "N/A"; lblOpenVal.Text = "N/A"; lblHighVal.Text = "N/A"; lblLowVal.Text = "N/A"; lblBidVal.Text = "N/A"; lblAskVal.Text = "N/A"; lblVolumeVal.Text = "N/A"; } }
When the user enters a stock quote and clicks the Get Quote button, an instance of the web service is created. If the user clicks GetDetailQuote on the resulting screen, then the GetDetailQuote method is called and populates the labels with the returned data. If the user clicks GetQuickQuote, the GetQuickQuote method is called and populates the Price label with the price returned by the web service and fills all other labels with the value N/A. Overall, the .NET Compact Framework is built on the same concepts that you already know, so you gain the knowledge of building secure applications for mobile devices along with learning VB.NET and C# applications. 2.2.2 Effectively utilizing ADO.NET Microsoft has extended ADO.NET to include the Oracle and ODBC .NET data providers. That means you can natively use ADO.NET to access Oracle databases and ODBC databases without having to perform a separate download and install to gain access to these features. In this section, you ll learn about ADO.NET by looking at different ways to connect to databases other than SQL Server. Connecting to Oracle If you are querying against an Oracle database, you want to use the Oracle .NET Data Provider because it gives you the best performance (much like the SqlClient for SQL Server). The Oracle provider is located in the System.Data.OracleClient namespace in the .NET Framework. Until this provider was available, developers had to use the OLEDB .NET Data Provider when accessing Oracle databases. Although that approach is acceptable for accessing any database, the Oracle .NET Data Provider yields much stronger performance, similar to the SQL Server .NET Data Provider. When you use the Oracle .NET Data Provider, you bypass the need to use OLEDB drivers in order to perform queries. This dramatically increases the performance of your application because you don t have to go through a middleman (OLEDB) to access the database. The calls are sent directly into Oracle by using the Oracle Call Interface (OCI), which give you a hook into the database from your application. (The OCI is the technology used by the Oracle client software.) The .NET Data Provider for Oracle provides support for the new data types that were introduced in Oracle 9i, as NEW FEATURES OF VERSION 1.1 19
well as ref cursors. Ref cursors become useful when you are running stored procedures that return result sets. Your Oracle database must be 8i Release 3 (8.1.7) or later to be able to use the .NET Data Provider for Oracle. If your database meets the version requirements, it is easy to use the Oracle .NET Data Provider. Let s take a look at a code sample (listing 2.2) and learn how to use the Oracle .NET Data Provider to connect to a database.
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