Practical Activities in VB.NET

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Figure A129
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Choosing a layout for the form and database controls
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Finally, press the > button to establish the relationship, and press Next (note that the > button is disabled unless a suitable name (with no spaces) is entered for the relationship) 16 Choose the tables and elds you wish to appear on the form The default of both tables and all elds is ne Press Next 17 The nal page of the Wizard lets you choose how the master-detail data will be displayed The main choice is between all the master records in a grid or on separate controls A grid will display a number of rows of the master table, while individual controls will show only one record at a time Choose individual controls The child records in the Titles table can only be displayed in a grid format 18 You can select only the additional controls you need on the form these allow records to be added, deleted, etc (see Figure A129) Leave the default (all additional controls selected) 19 Press Finish, to complete the Wizard It will now go on to create the form and populate it with code (see Figure A1210) This form is fully functional and so can be integrated immediately with other forms in the project To do this, we need to add only the two statements in Listing A121 to the btnPublishers (added in Activity 2) event-handler
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Private Sub btnPublishers_Click(ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) _ Handles btnPublishersClick Dim F As New frmPublishers() FShowDialog() End Sub Listing A121: Code to load the Publishers form
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12 n Databases in Visual Basic NET
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Figure A1210
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The Wizard-build data access form
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Test the program at this stage and you should nd that once the main form has loaded, pressing the Publishers button will load the Publishers DataForm You need to press Load to show the DataSet, but having done this you will be able to skip from record to record using the navigation buttons added to the form
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Activity 4: Changing the master-detail form
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The Wizard-generated form is fully functional, but the design is not ideal For one thing, the default sizes of the master table s TextBox controls for viewing are mostly too small You can resize these but will also need to resize the form to accommodate them The grid at the bottom of the form is also too narrow to show the child records It is also a bit unnecessary to have to press the Load button to load up the DataSet since having opened this form, its only purpose is to view data The easiest x for this is to cut the code from the Load button s event-handler and paste it into a Form_Load() event-handler Double-click on the form s background to generate a FormLoad() eventhandler 2 Locate the btnLoad_Click() event-handler and select all of the code within it (but not the rst and last lines) Cut this code from the event-handler (press + Ctrl+X) 3 Go back to the Form_Load() event-handler, place the cursor between the rst + and last line, and paste the code into it (Ctrl+V) 1
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Practical Activities
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You can now remove the Load button, and the vestiges of its -Click eventhandler sub 5 Rearrange the other controls on the form to be less wasteful of space having removed the Load button, the Update and Cancel buttons can be moved to occupy less space; the text boxes can be widened and the label controls reduced in width to give them space 6 Set the Anchor property of the grid control to Top, Bottom, Left, so that it resizes with the form without covering the other controls The re-shaped form could appear as shown in Figure A1211
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Figure A1211
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The re-organized form
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Note that the form will take a little longer to open now because the data loading stage is included as it opens This completes the activities for this chapter and the book
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