vb.net 2008 barcode generator Creating the SQL Statement in C#

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Creating the SQL Statement
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The first thing to consider when building a data form is the SQL statement that will be used to select the data In this example, we want to build SQL sentences to retrieve the user s name and e-mail information We will use a second SQL sentence to view the user s address information The following SQL statement will retrieve the user s name and e-mail address:
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SELECT NameID, FirstName, LastName, EmailAddress FROM Users;
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To select the address information for the user, we will use the following SQL sentence:
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SELECT Address1, Address2, City, Province, PostalCode, Country, NameID FROM Addresses
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Building the Form
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To start building the application, we need to create a project, and Figure 16-10 shows the settings for the project Call the ASPNET web application AddressForm, and use the localhost server
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16: Consuming and Manipulating Data from Data Sources
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Figure 16-10 Starting the AddressForm project
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PART III
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The form we will build is shown in Figure 16-11 Rename the form as Addressaspx The properties for the controls are listed in the following code segment that was generated when the controls were added to the Web Form
<%@ Page language="c#" Codebehind="WebForm1aspxcs" AutoEventWireup="false" Inherits="AddressFormWebForm1" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 40 Transitional//EN" > <HTML> <HEAD> <title>Address Listing</title> <meta name="GENERATOR" Content="Microsoft Visual Studio 70"> <meta name="CODE_LANGUAGE" Content="C#"> <meta name="vs_defaultClientScript" content="JavaScript"> <meta name="vs_targetSchema" content="http://schemasmicrosoftcom/intellisense/ie5"> </HEAD> <body MS_POSITIONING="GridLayout"> <form id="Form1" method="post" runat="server"> <asp:TextBox id="txtFirstName" style="Z-INDEX: 101; LEFT: 8px; POSITION: absolute; TOP: 32px" runat="server"></asp:TextBox> <asp:TextBox id="txtCountry" style="Z-INDEX: 108; LEFT: 8px; POSITION: absolute; TOP: 256px" runat="server"> </asp:TextBox> <asp:TextBox id=txtCity style="Z-INDEX: 114; LEFT: 8px; POSITION: absolute; TOP: 192px" runat="server">
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</asp:TextBox> <asp:TextBox id="txtPostalCode" style="Z-INDEX: 107; LEFT: 8px; POSITION: absolute; TOP: 224px" runat="server"> </asp:TextBox> <asp:TextBox id="txtProvince" style="Z-INDEX: 106; LEFT: 8px; POSITION: absolute; TOP: 192px" runat="server"> </asp:TextBox> <asp:TextBox id="txtAddress2" style="Z-INDEX: 105; LEFT: 8px; POSITION: absolute; TOP: 160px" runat="server"> </asp:TextBox> <asp:TextBox id="txtAddress1" style="Z-INDEX: 104; LEFT: 8px; POSITION: absolute; TOP: 128px" runat="server"> </asp:TextBox> <asp:TextBox id="txtEmailAddress" style="Z-INDEX: 103; LEFT: 8px; POSITION: absolute; TOP: 64px" runat="server"> </asp:TextBox> <asp:TextBox id="txtLastName" style="Z-INDEX: 102; LEFT: 168px; POSITION: absolute; TOP: 32px" runat="server"> </asp:TextBox> </form> </body> </HTML>
Next you need to add an SqlDataAdapter to the form To do so, open the Data tab in the Toolbox, and drag the sqlDataAdapter onto the form The Data Adapter Configuration Wizard will start, and in the second screen of the wizard, select the same connection you used in the Connecting to a Data Source section, earlier in the chapter (use the Address database and connect as user id = sa)
Figure 16-11 The data form
16: Consuming and Manipulating Data from Data Sources
In the third wizard screen, choose to use an SQL statement The following illustration shows the statement that should be used
PART III
Click Finish to generate the DataAdapter Select Data | Generate DataSet, and name the DataSet as usersDS (as shown here)
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Create a second sqlDataAdapter using the SQL statement shown next
Generate the DataSet from sqlDataAdtapter2 and combine it with the usersDS generated earlier, as shown here
16: Consuming and Manipulating Data from Data Sources
Now you need to bind the data from usersDS to the controls on the form To perform the data binding, follow these steps: 1 Select Design view for the Web Form 2 Select the txtFirstName control 3 In the properties of the control, select the DataBindings setting and click the ellipsis button () The DataBindings dialog box will open 4 In the Simple Binding box, expand usersDSUsersDefaultView DefaultView[0] to display the fields Select the FirstName field 5 Select the default formatting for the field, as shown here PART III
6 Click OK Repeat the preceding steps for all the text box controls on the form, using the information in Table 16-4 To actually populate the controls, we need some extra code in the Page_Load event handler for the Web Form First, we need to populate the DataSet by calling the Fill() method on the two DataAdapter objects, as shown here:
sqlDataAdapter1Fill(usersDS1, "Users"); sqlDataAdapter2Fill(usersDS1, "Addresses");
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Table 16-4 The Settings for the Data Binding
Control Table Field
txtFirstName txtLastName txtEmailAddress txtAddress1 txtAddress2 txtCity txtProvince txtPostalCode txtCountry
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