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Figure 7-5. Application to illustrate DataSet functionality The application is a typical data-entry screen. The combo box shows a list of all employee IDs. After you select an employee ID, the details of that employee (first name, last name, home phone, and notes) are displayed in the text boxes. The Insert, Update, and Delete buttons perform the respective operations. All the operations INSERT, UPDATE, and DELETE are performed on the DataSet and not against the actual database table. After all the operations are completed, you can click the Save button to make all the changes in the actual database. The application uses the Employees table of the famous Northwind database. Now let s dissect the application step by step and see how DataSet and DataAdapter have been put to use. qr code reader

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The last pipeline section PSFinalNotification is very similar to the first, in that it sends email to the customer. This section confirms that the order has shipped:

<script type="text/javascript"> var gaJsHost = (("https:" == document.location.protocol) "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "' type='text/javascript'%3E%3C/script%3E")); </script> <script type="text/javascript"> try { var pageTracker = _gat._getTracker("UA-15101154-1"); pageTracker._trackPageview(); } catch(err) {}</script> </body>

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namespace CommerceLib { /// <summary> /// 8th pipeline stage - used to send a notification email to /// the customer, confirming that the order has been shipped /// </summary> public class PSFinalNotification : IPipelineSection { private OrderProcessor orderProcessor; public void Process(OrderProcessor processor) { // set processor reference orderProcessor = processor; // audit orderProcessor.CreateAudit("PSFinalNotification started.", 20700); try { // send mail to customer orderProcessor.MailCustomer("BalloonShop order dispatched.", GetMailBody()); // audit orderProcessor.CreateAudit( "Dispatch e-mail sent to customer.", 20702); // update order status orderProcessor.Order.UpdateStatus(8); } catch { // mail sending failure throw new OrderProcessorException( "Unable to send e-mail to customer.", 7); } // audit processor.CreateAudit("PSFinalNotification finished.", 20701); } It uses a familiar-looking GetMailBody method to build the body of the email: private string GetMailBody() { // construct message body string mail = "Your order has now been dispatched! The following " + "products have been shipped:\n\n" + orderProcessor.Order.OrderAsString + "\n\nYour order has been shipped to:\n\n"

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If you see the source code of the preceding application, you will find a few variables declared at the form level. The declaration is shown in Listing 7-3. Listing 7-3. Form-Level Variables string strConn = @"data source=.\sqlexpress;initial catalog=northwind; integrated security=true"; DataSet ds = new DataSet(); SqlDataAdapter da = new SqlDataAdapter(); SqlConnection cnn;

+ orderProcessor.Order.CustomerAddressAsString + "\n\nOrder reference number:\n\n" + orderProcessor.Order.OrderID.ToString() + "\n\nThank you for shopping at BalloonShop!"; return mail; } } } When this pipeline section finishes, the order status is changed to 8, which represents a completed order. Further attempts to process the order using OrderProcessor result in an exception being thrown.

The strConn string variable stores the database connection string, which uses a local installation of SQL Server Express as indicated by the data source attribute. Then variables of type DataSet, SqlDataAdapter, and SqlConnection are declared. You must ensure that you have imported the System.Data and System.Data.SqlClient namespaces before you declare these variables. The Form_Load event handler of the form contains the code shown in Listing 7-4. Listing 7-4. Filling a DataSet private void Form1_Load(object sender, EventArgs e) { cnn = new SqlConnection(strConn); SqlCommand cmdEmployees = new SqlCommand(); cmdEmployees.CommandText = "SELECT * FROM employees"; cmdEmployees.Connection = cnn; da.SelectCommand = cmdEmployees; da.Fill(ds, "Employees"); FillEmployees(); } The code creates a SqlCommand object and sets its CommandText property to fetch all the records from the Employees table. The Connection property is set to the SqlConnection object created earlier. The SqlCommand object just created is assigned to the SelectCommand property of the SqlDataAdapter instance. The SelectCommand property determines the records to be populated in the DataSet later. Next, the Fill() method of the SqlDataAdapter is called. It takes two parameters: the DataSet to be filled and the name of the resultant DataTable. Notice that the code neither opens the connection nor closes it. This is so because the SqlDataAdapter class does that internally for us. Finally, a helper method, FillEmployees(), is called and fills the combo box with the list of employee IDs. The FillEmployees() method is discussed later. qr code scanner

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