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Microsoft Office Access 2003 Inside Out The first secret is that the row source for the Product combo box is a parameter query that filters the products based on the product type you chose. When you use this technique in a form in single form view, all you need to do is requery the filtered combo box (in this case, the Product combo box) when the user moves to a new record (in the Current event of the form) and requery when the user chooses a different value in the combo box that provides the filter value (in the After Update event of the combo box providing the filter value). However, using this technique on a form in continuous form view is considerably more complex. Even though you can see multiple rows in a continuous form, there is actually only one copy of each control on the form. If you always requery the Product combo box each time you move to a new row, the product name displayed in other rows that have a different product type will appear blank! When the value in a row doesn t match a value in the list, you get a blank result, not the actual value of the field. The way to solve this is to include the display name in the recordset for the form and carefully overlay each combo box with a text box that always displays the correct value regardless of the filter. You can open the fsubContactProducts form in Design view to see how I did this. Figure 23-19 shows you the form with the two overlay text boxes (CategoryDescription and ProductName) pulled down from the underlying combo boxes (Unbound and ProductID).

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Figure 23-19.

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In many ways, starting our discussion with the manual method is like learning to ride a unicycle before riding a bicycle with training wheels. However, starting with the basics helps us to better appreciate the other options. We ll also have a better understanding of the code generated by the other tools. In the previous chapter we identified LINQ to SQL s three main types of attributes Table, Column, and Association. We can decorate our classes with the Table attribute to designate how the object maps to a database table. Properties can be decorated with either the Column attribute or the Association attribute. The Column attribute designates how an individual property maps to a column in the table. The Association attribute designates how tables are related to each other via foreign-key relationships. In addition to these three attributes, there are a number of less frequently used attributes. Table 7.1 provides a brief overview of the basic functionality of each of these attributes.

Notice that the control source of the Product combo box is actually the ProductID field, but the combo box displays the ProductName field. Also, the Product Type combo box isn t bound to any field at all there is no CategoryDescription field in tblContactProducts but it does display the CategoryDescription field from the lookup table. To make this work, you need to include the ProductName and CategoryDescription fields in the record source for this form. You don t want the user to update these values, but you need them to provide the overlay display. These two text boxes have their Locked property set to Yes to prevent updating and their Tab Stop property set to No so that the user will tab into the underlying combo boxes and not these text boxes. Figure 23-20 shows you the qryContactProducts query that s the row source for this form.

Figure 23-20. A query that provides the necessary ProductName and CategoryDescription fields from a related table so that you can display the values.

To make it all work correctly, several event procedures make sure the focus goes where necessary and that the filtered Product combo box gets requeried correctly. The code behind the fsubContactProducts form that does this is as follows:

If partitions are already formatted appropriately, you can instruct Setup to skip this step After Setup formats the system partition, Setup copies the Boot Manager program (Bootmgr) that Windows uses to the system partition (the system volume) Another of Setup s roles is to prepare the Boot Configuration Database (BCD), which on BIOS systems is stored in the \Boot\BCD file on the root directory of the system volume This file contains options for starting the version of Windows that Setup installs and any preexisting Windows installations If the BCD already exists, the Setup program simply adds new entries relevant to the new installation..

Private Sub CategoryDescription_GotFocus() We have some tricky "overlay" text boxes here that shouldn t get the focus. Move focus to the underlying combo box if that happens. Me.cmbCategoryDescription.SetFocus End Sub Private Sub cmbCategoryDescription_AfterUpdate() If they pick a new Category, then requery the product list that s filtered on category Me.cmbProductID.Requery Set the Product to the first row in the new list Me.cmbProductID = Me.cmbProductID.ItemData(0) .. and signal Product after update. cmbProductID_AfterUpdate End Sub Private Sub Form_Current() If we have a valid Category Description on this row... If Not IsNothing(Me.CategoryDescription) Then Then make sure the unbound combo is in sync. Me.cmbCategoryDescription = Me.CategoryDescription End If Requery the product list to match the current category Me.cmbProductID.Requery End Sub

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