The one disadvantage is that grouping many panels on a page can become somewhat unmanageable. in .NET

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Lab 12.1: Maintaining State
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In this lab, you explore several methods of maintaining state in an ASP.NET application while changing from one Web page to another. You work with the CustomerList.aspx page, which currently displays a list of customers in a DataGrid and contains a button to save a customer s orders to an XML file. The program is modified by adding a summary information page. After saving, the page transfers the user to the summary information page. This page retrieves data from the CustomerList.aspx page and displays it. Modify the Customer List Page In this section, you modify the CustomerList.aspx code-behind page to expose the data that is required in the InformationSummary page. 1. To start this lab, open the OrderEntrySystemSolution from Lab 11.1. 2. Right-click the OrderEntrySystemSolution in the Solution Explorer, and click Check Out. 3. Open the CustomerList.aspx code behind page. 4. At the bottom of the dgCustomers_ItemCommand subprocedure, add code to store the customer information from the DataGrid in the following variables: CustomerID, CustomerName, and ContactName. These variables are scoped to be available anywhere within the request.
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5. Add code to transfer to the InformationSummary.aspx page. The following code shows the finished subroutine:
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Private Sub dgCustomers_ItemCommand( _ ByVal source As Object, _ ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) _ Handles dgCustomers.ItemCommand If e.CommandName = Save Then Dim ds As DataSet = CType(Session( Customers ), DataSet) Dim xml As XmlDataDocument If Session( CustomersXml ) Is Nothing Then xml = New XmlDataDocument( Session( Customers )) Session( CustomersXml ) = xml Else xml = CType( _ Session( CustomersXml ), XmlDataDocument) End If Dim path As String = Server.MapPath( . ) & \ Get Customer Key Dim CustomerKey As String CustomerKey = dgCustomers.DataKeys(e.Item.ItemIndex) path &= CustomerKey & .xml Open the XmlWriter. Dim xmlWriter As New XmlTextWriter(path, _ System.Text.Encoding.UTF8) xmlWriter.WriteStartDocument() Dim CustomerXml As XmlNode Dim xPathQuery As String xPathQuery = String.Format( _ //Customers[@CustomerID= {0} ] , CustomerKey) CustomerXml = xml.SelectSingleNode(xPathQuery) CustomerXml.WriteTo(xmlWriter) xmlWriter.Close() Context.Items( CustomerKey ) = CustomerKey Context.Items( CompanyName ) = e.Item.Cells(2).Text Context.Items( ContactName ) = e.Item.Cells(3).Text Server.Transfer( InformationSummary.aspx ) End If End Sub
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Create the Summary Information Form In this section, you create a Web Form that displays summary information. 1. Right-click the Customer project. Click Add, click Add Web Form, and name the new page InformationSummary.aspx. 2. Change the PageLayout properties to FlowLayout. 3. Add a title to the page. The title should be Information Summary. 4. Add a label control under the title. 5. In the code-behind page, add code to retrieve the CustomerID, CustomerName, and ContactName from the CustomerList.aspx page, and display this data in the Label control. The following code shows the finished Page_Load method:
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Private Sub Page_Load( _ ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles MyBase.Load Label1.Text = Customer ID: & _ Context.Items( CustomerKey ) & <br> Label1.Text &= Customer: & _ Context.Items( CompanyName ) & <br> Label1.Text &= Contact: & _ Context.Items( ContactName ) & <br> End Sub
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Test the Information Summary Page To test the ability to store data while transferring the user to another page, the CustomerList page must be set as the startup page, and the project can be started. After that, a customer is selected, and the data should be displayed on the InformationSummary page. 1. Right-click the CustomerList.aspx page in the Solution Explorer, and click Set As Start Page. 2. Run the application. The results should appear as shown in Figure 12.14.
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Figure 12.14 The CustomerList.aspx page.
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3. Click the Save button of one customer. This saves the customer s orders as XML, and performs a transfer to the InformationSummary.aspx page, as shown in Figure 12.15. 4. Save the Solution, and check it back into Visual SourceSafe.
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Figure 12.15 The browser output when passing data between pages by using the Context.Items collection.
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