4: Advanced Controls and Customization in Visual Studio .NET

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Figure 442: Sample data source for the Master/Detail example
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Once you ve inserted these two controls, open the properties dialog for the Repeating Table and click on the Master/Detail tab Since this control contains the personal data for each salesperson, we are going to designate it as the master control Doing so is very easy just click the Set as master option button Then, specify an ID to use to identify this master control Later, this ID will be used to link a detail control to the master In this example, let s just specify the ID for the master control as SalesPersonData (Figure 443 shows the Master/ Detail tab after designating the Repeating Table as the master)
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Figure 443: Master/Detail tab for a Repeating Table set as the master control
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Design-Time Visuals for Master/Detail Controls
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When you initially create a master/detail relationship using the Master/ Detail tab instead of inserting the control from the Controls task pane, the master control will show a warning design-time visual before you specify the detail control Don t be alarmed This expected warning is intended to alert you in cases where you have deleted a detail control connected to a master This is just a warning, so the control will still work correctly even if you never specify the detail control However, after you have established the master/detail relationship, if you delete the master control, the detail control will show an error design-time visual This case is an error instead of a warning due to the fact that having a detail without a master is not usually what you intend (As with other design-time visuals, you can choose More Details from the context menu for a control that shows a warning or an error to see more information about the problem, including suggested remedies)
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Once you ve set the Repeating Table as the master control, you ll want to set the Repeating Section you inserted as the detail control As with the master, you set the Repeating Section as the detail control by using the Master/Detail tab Figure 444 shows the Master/Detail tab for the Repeating Section (One thing to note in Figure 444 is that you can t use a Repeating Section as a master control However, it is possible to use either a Repeating Section or a Repeating Table as the detail control) In order to set this control as the detail, you must rst select the Set as detail option Then, from the Link to master ID drop-down list box, choose the ID of the master control to which you want to link this detail control In this case, we ve chosen SalesPersonData Next, in the Master/detail relationship section of this tab, specify how the detail control is linked to the master By default, when you insert a Master/Detail control from the Controls task pane, since both controls are bound to the same group node in the data source, the detail control is linked to the master by position in the data source This basically means that, when a user lls out a form that contains a Master/Detail
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4: Advanced Controls and Customization
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Figure 444: Master/Detail tab for a Repeating Section set as a detail control
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control, the rst master control in the form is linked to the rst detail control, the second master to the second detail, and so on For our example, since the Repeating Table is bound to the SalesPeople group node and the Repeating Section is bound to the Sales group node, we want to select the By key eld option This option allows us to link the detail control to the master by using two elds from the data source In database terminology, these are the keys we ll use to join the two groups In this case, we have linked the detail to the master by using the ID of the salesperson (The data source does not permit us to have two elds with the same name Therefore, we have named one SalesPersonID and the other SellerID Even though they are named differently, these two elds will contain the same data the ID of the salesperson) Linking the detail to the master by the salesperson ID means that, when a user lling out the form selects a salesperson from the master control, the sales data for the salesperson with the corresponding ID will be shown in the detail control When you link a detail control to a master control by using a key eld, the Copy key eld from selected master when inserting detail checkbox at the
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