HUsing ADO.NET 2.0 with Microsoft Access Databases - Cengage ...

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8 Appendix H Using ADO.NET 2.0 with Microsoft Access Databases Bound controls are also referred to as data-aware controls. BINDING THE OBJECTS IN A DATASET For the user to view the contents of a dataset while an application is running, you need to connect one or more objects in the dataset to one or more controls in the interface. Connecting an object to a control is called binding, and the connected controls are called bound controls. Figure H.9 lists various ways of binding the objects in a dataset. Notice that you can bind an object either to a control that the computer creates for you, or to an existing control in the interface. HOW TO… Bind the Objects in a Dataset To have the computer create a control and then bind an object to it: 1. In the Data Sources window, click the object you want to bind. 2. If necessary, use the object’s list arrow to change the control type. 3. Drag the object to an empty area on the form, then release the mouse button. The computer creates the appropriate control and binds the object to it. To bind an object to an existing control: 1. In the Data Sources window, click the object you want to bind. 2. Drag the object to the control on the form, then release the mouse button. OR 1. Click the control on the form. 2. Use the Properties window to set the appropriate property or properties. (Refer to the Binding to an Existing Control section in this appendix.) FIGURE H.9 How to bind the objects in a dataset Appendix H C5779 39147 Page 8 07/10/06--JHR Having the Computer Create a Bound Control As indicated in Figure H.9, one way to bind an object from a dataset is to drag the object to an empty area on the form. When you do this, the computer creates the necessary control and automatically binds the object to it. The icon that appears before the object’s name in the Data Sources window indicates the type of control the computer will create. For example, the icon shown in Figure H.10 indicates that the computer will create a DataGridView control when you drag the tblEmploy table object to the form. A DataGridView control displays the table data in a row and columnar format, similar to a spreadsheet. Each row in the control represents a record, and each column represents a field. The icon, on the other hand, indicates that the computer will create a text box when you drag a field object to the form.
Binding the Objects in a Dataset 9 This icon indicates a DataGridView control This icon indicates a TextBox control You can use the list arrow to change the control type FIGURE H.10 Icons displayed in the Data Sources window Appendix H C5779 39147 Page 9 07/10/06--JHR You can use the list arrow that appears next to an object’s name to change the type of control the computer will create. For example, to display the tblEmploy data in separate text box controls, rather than in a DataGridView control, you first click tblEmploy in the Data Sources window. You then click its list arrow, as shown in Figure H.11, and then click Details in the list. The Details option tells the computer to create a separate control for each field in the table. FIGURE H.11 Result of clicking the tblEmploy table object’s list arrow Similarly, to display the Last_Name field data in a label control rather than in a text box, you first click Last_Name in the Data Sources window. You then click its list arrow, as shown in Figure H.12, and then click Label in the list. FIGURE H.12 Result of clicking the Last_Name field object’s list arrow
Page 1 and 2: H Using ADO.NET 2.0 with Microsoft
Page 3 and 4: Database Terminology 3 Notice that
Page 5 and 6: Connecting a Database to an Applica
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Page 17 and 18: Accessing the Records in a Dataset
Page 19 and 20: Dataset Designer 19 You can use the
Page 21 and 22: Dataset Designer 21 Appendix H C577
Page 23 and 24: Dataset Designer 23 3. In the Choos
Page 25 and 26: Dataset Designer 25 Used by the WHE
Page 27 and 28: Dataset Designer 27 The user can ru
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Page 33 and 34: Programming Tutorial 33 Appendix H
Page 35 and 36: Programming Tutorial 35 5. Click th
Page 37 and 38: Programming Tutorial 37 Option Expl
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Page 45 and 46: Review Questions 45 3. A group of r
Page 47 and 48: Computer Exercises 47 3. Write a SE
Page 49 and 50: Case Projects 49 c. Allow the user

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