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The code uses the DLookup function to see if another reservation exists (but a different request ID) for the same employee with dates that overlap. The criteria asks for any record that has a check-in date less than the requested check-out date (an employee can legitimately check out and then check back in on the same date) and a check-out date that is greater than the requested check-in date. You might be tempted to build more complex criteria that checks all combinations of reservations that overlap into the start of the requested period, overlap into the end of the requested period, span the entire requested period, or are contained wholly within the requested period, but the two simple tests are all you need. (Draw it out on a sheet of paper if you don t believe me!)

The Windows network architecture provides a flexible infrastructure for networking APIs, network protocol drivers, and network adapter drivers. The Windows networking architecture takes advantage of I/O layering to give networking support the extensibility to evolve as computer networking evolves. When new protocols appear, developers can write a TDI transport to implement the protocol on Windows. Similarly, new APIs can interface to existing Windows protocol drivers. Finally, the range of networking APIs implemented on Windows affords network application developers a range of possible implementations, each with different programming models and protocol support.

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By explicitly stating that we want to retrieve the results, we force LINQ to SQL to immediately fetch the results and populate a new generic List with the resulting Subject objects. This has the advantage of not requiring round trips to the database each time we want to fetch our list. Additionally, we can use the LINQ to Objects query mechanisms to continue to manipulate our results and perform grouping, joining, aggregating, or sorting as necessary.

In 13, Advanced Form Design, you learned how to create a multiple-page form as one way to handle displaying more data than will fit on one page of a form on your computer screen. You also learned how to control simple tabbing on the form by setting the form s Cycle property to Current Page. One disadvantage of this approach is you can no longer use Tab or Shift+Tab to move to other pages or other records. You must use the Page Up and Page Down keys or the record selector buttons to do that. You can set Cycle to All Records to restore this capability, but some strange things happen if you don t add code to handle page alignment. To see what happens, open the frmXmplContactsPages form in the LawTrack Contacts sample database (Contacts.mdb) from the Database window. Move to the last record using the record selector buttons, and press Page Down to move to the Home Address field for the last contact. Next press Shift+Tab once (back tab). Your screen should look something like Figure 23-11.

Figure 23-11. The form page doesn t align correctly when you back-tab from the Home Address field in frmXmplContactsPages.

Automating Your Application with Visual Basic If you leave the Cycle property set to All Records or Current Record, tabbing across page boundaries causes misalignment unless you add some code to fix it. What happens is that Access moves the form display only far enough to show the control you just tabbed to. (In this example, you re tabbing to the Notes text box control.) Open the sample frmContactsPages form that has the code to fix this problem and try the same exercise. You should discover that Shift+Tab places you in the Notes field, but the form scrolls up to show you the entire first page. To allow tabbing across a page boundary while providing correct page alignment, you need event procedures in the Enter event for the first and last controls that can receive the focus on each page. If you examine the code behind the frmContactsPages form, you ll find these four procedures:

Private Sub ContactID_Enter() If tabbing forward into this field from previous record align page 1 Me.GoToPage 1 End Sub Private Sub HomeAddress_Enter() If tabbing forward into this field, align page 2 Me.GoToPage 2 End Sub Private Sub Notes_Enter() On Error Resume Next If tabbing backward into the last control on page 1, align it Me.GoToPage 1 End Sub Private Sub Photo_Enter() On Error Resume Next If tabbing backward into the last control on page 2, align it Me.GoToPage 2 End Sub

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