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MCAD/MCSD Visual C# NET Certification All-in-One Exam Guide
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The Theory of Data Binding
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Data binding involves linking properties of a control to a data source Data can be bound to both Windows Forms controls as well as Web Forms controls For a complete look at Web Forms and data binding, refer to 16 There are a number of objects that work together to produce data binding Two important objects are BindingContext and CurrencyManager: BindingContext Every form has a BindingContext object associated with it It acts like the manager of all CurrencyManager objects CurrencyManager is associated with every data source that you create The CurrencyManager is responsible for managing all the bindings to that data source The NET Framework allows you to use two different techniques for data binding: Simple binding is used when a control can bind to a single value Complex binding is used when the control is capable of holding multiple values In this section, we will look at the two different kinds of binding and at setting properties both at design time and run time EXAM TIP Microsoft will test you on your knowledge of data binding Pay particular attention in this section to binding programmatically to a data source
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Binding data at design time means that you can use the integrated development environment and the Property Explorer to set the binding properties of a control
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Simple Binding at Design Time
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Let s take our college application (shown in Figure 20-18) and bind the data source to the text boxes on the form In the steps that follow, we will work with the Student # text box, but you can set the properties of every text control in a similar fashion 1 Click on the Student # text box 2 Right-click to display the Properties Explorer 3 Expand the DataBindings section by clicking the plus (+) sign to the left
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20: Data in Windows Forms
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4 Click the ellipsis button (the button with the three dots) beside the Advanced field, and you will see the Advanced Data Binding dialog box shown in Figure 20-19 Notice that the list of properties is large remember, it s not just the traditional properties that can be bound to data 5 Select the Text property and click the ellipsis button in order to select the data source and the column of data to use (see Figure 20-20) As a shortcut approach for simple binding, you can just set the DataBindings Text property in the Property Explorer Once you close the Advanced Data Binding dialog box, you can run the application and see that the Student# field from the Student table is displayed in the correct text PART III
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Figure 20-19
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The Advanced Data Binding dialog box
MCAD/MCSD Visual C# NET Certification All-in-One Exam Guide
Figure 20-20 Setting the Text property
box You can do the same thing for all of the text boxes on the form to display all the information about the first student in the table (see Figure 20-21) TIP If you don t see the data, don t forget that you must manually populate the DataSet
Complex Binding at Design Time
Let s look now at how to bind data to a more complex type of control, like the ListBox or ComboBox Both of these controls are capable of displaying more than one record from the database In our college application, we have a Courses tab page, which when programmed correctly should display the courses related to the student s program However, since we haven t discussed table relationships yet, we will simply add a ListBox to the page and populate it with course names, as in Figure 20-22 In order to display multiple rows from a database, you should set the DataSource and DisplayMember properties of the ListBox control as follows: DataSource: Choose the DataSet object that represents the table from which the data will be extracted DisplayMember: Select the field (or column) or data that should be displayed
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