<asp:RadioButton> <asp:CheckBox> <asp:Button> <asp:TextBox rows="1"> <asp:TextBox rows="5"> in Visual C#.NET

Maker QR in Visual C#.NET <asp:RadioButton> <asp:CheckBox> <asp:Button> <asp:TextBox rows="1"> <asp:TextBox rows="5">

<asp:RadioButton> <asp:CheckBox> <asp:Button> <asp:TextBox rows="1"> <asp:TextBox rows="5">
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The HTML that ASP.NET actually serves to the web browser does not contain these tags beginning with asp: which is just as well, because no browser would know what to make of them. It converts them all into standard HTML, so from a client-side perspective, there s no difference between these ASP.NET web controls and HTML controls. It s purely a matter of what API you d like to use on the server side: do you want your server-side code to work with the same element types and property names as you will see on the client, or would you prefer your controls to use the same conventions as all the other .NET classes you use The remainder of this chapter focuses on web controls.
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Data Binding
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While some of the content in a web application may be fixed, any interesting website will change over time. So it s highly likely that you ll want some of the controls on your web page to display data that can change from time to time, and which is probably stored in a database. Many ASP.NET controls can be data-bound, which simplifies display and modification of data. In the preceding section we hardcoded radio buttons onto a form one for each of three shippers. That can t be the best way to do it relationships with suppliers change, and there s a good chance that we may want to work with different shippers in the future. We don t really want to have to go back and rewire the controls each time that kind of business relationship changes. It makes more sense to store the list of shippers in a database, and have the UI reflect that. (In fact, if you re familiar with Microsoft s sample databases, you may recognize the three shippers in the earlier examples as the ones provided in the Northwind sample database.) This section shows you how you can create these controls dynamically and then bind them to data in the database, by using the RadioButtonList control s data binding support. Add a new web form called DisplayShippers.aspx to your project. Put the editor into Split mode. From the toolbox, drag a RadioButtonList onto the new form, either onto the design pane or within the <div> in the Source view.
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If you don t see the radio buttons on the left of your work space, try clicking on View Toolbox to open the toolbox, and then expanding the Standard tab of the toolbox. Right-click on any control in the toolbox, and choose Sort Items Alphabetically.
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In the Design pane, click on the new control s smart tag the little arrow that appears at the top right of the control. Then, select Choose Data Source and the Data Source Configuration dialog opens, as shown in Figure 21-3.
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Drop down the Select a data source menu and choose <New Data Source>. You are then prompted to choose a data source from the datatypes on your machine. Select Database, assign it an ID, and click OK. The Configure Data Source dialog box opens, as shown in Figure 21-4. You can either choose an existing connection, or in this case, choose New Connection to configure a new data source, and the Add Connection dialog opens.
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Fill in the fields: choose your server name, how you want to log in to the server (if in doubt, choose Windows Authentication), and the name of the database (for this example, Northwind). Be sure to click Test Connection to test the connection. When everything is working, click OK, as shown in Figure 21-5. After you click OK, the connection properties will be filled in for the Configure Data Source dialog. Review them, and if they are OK, click Next. On the next wizard page, name your connection (e.g., NorthWindConnectionString) if you want to save it to your web.config file. When you click Next, you ll have the opportunity to specify the tables and columns you want to retrieve, or to specify a custom SQL statement or stored procedure for retrieving the data. Open the Table list, and scroll down to Shippers. Select the ShipperID and CompanyName fields, as shown in Figure 21-6.
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Click Next, and test your query to see that you are getting back the values you expected, as shown in Figure 21-7. It is now time to attach the data source you ve just built to the RadioButtonList. A RadioButtonList (like most lists) distinguishes between the value to display (e.g., the name of the delivery service) and the value of that selection (e.g., the delivery service ID). Set these fields in the wizard, using the drop down, as shown in Figure 21-8.
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