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We get compile-time checking for all queries. Unlike SQL statements today, where we typically only find out at runtime if something is wrong, this means we can check during development that our code is correct. The direct benefit is a reduction of the number of problems discovered late in production. Most of the time, issues come from human factors. Strongly typed queries allow us to detect early typos and other mistakes made by the developer in charge of the keyboard. We get IntelliSense within Visual Studio when writing LINQ queries. This not only makes typing faster, but also makes it much easier to work against both simple and complex collection and data source object models.

Private Sub cmdPick_Click() Dim intReturn As Integer Call the build a reservation proc in the calling form intReturn = Form_frmUnbookedRequests.Bookit(Me.FacilityID, Me.RoomNumber, _ Me.DailyRate, Me.WeeklyRate) If (intReturn = True) Then MsgBox "Booked!", vbExclamation, gstrAppTitle Else MsgBox "Room booking failed. Please try again.", _ vbCritical, gstrAppTitle End If DoCmd.Close acForm, Me.Name End Sub

Can you figure out what s happening Back in frmUnbookedRequests, there s a public function called Bookit that this code calls as a method of that form. It passes the critical FacilityID, RoomNumber, DailyRate, and WeeklyRate fields to complete the booking. Back in frmUnbookedRequests, the code in the public function is as follows:

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Public Function Bookit(lngFacility As Long, lngRoom As Long, _ curDaily As Currency, curWeekly As Currency) As Integer Sub called as a method by fdlgAvailableRooms to book the selected room Caller passes in selected Facility, Room number, and rates Dim db As DAO.Database, rstRes As DAO.Recordset Dim varResNum As Variant, strSQL As String, intTrans As Integer Set error trap On Error GoTo BookIt_Err Get a pointer to this database Set db = CurrentDb Open the reservations table for insert Set rstRes = db.OpenRecordset("tblReservations", _ dbOpenDynaset, dbAppendOnly) Start a transaction BeginTrans intTrans = True Get the next available reservation number varResNum = DMax("ReservationID", "tblReservations") If IsNull(varResNum) Then varResNum = 0

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This is all well and good, but where does LINQ come from Before delving into LINQ and starting to use it, let s see how it was born.

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The record source of the fdlgAvailableRooms form is a parameter query that filters out rooms already booked for the specified dates and includes the remaining rooms that match the requested room type. The code behind the Book button adds a filter for the smoking or nonsmoking request because the room type doesn t include this information but each specific available room does. Behind the Pick This button on the fdlgAvailableRooms form, you can find the following code:

projects involving evolutions of programming languages and data-access methods can be considered to be the parents of LINQ to Objects, LINQ to XML (formerly known as XLinq), and LINQ to SQL (formerly known as DLinq). C (or the C-Omega language) C (pronounced c-omega ) was a project from Microsoft Research that extended the C# language in several areas, notably the following:

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varResNum = varResNum + 1 Update the current row strSQL = "UPDATE tblReservationRequests SET ReservationID = " & _ varResNum & " WHERE RequestID = " & Me.RequestID db.Execute strSQL, dbFailOnError Book it! rstRes.AddNew Copy reservation ID rstRes!ReservationID = varResNum Copy employee number rstRes!EmployeeNumber = Me.EmployeeNumber Copy facility ID from the room we picked rstRes!FacilityID = lngFacility .. and room number rstRes!RoomNumber = lngRoom Set reservation date = today rstRes!ReservationDate = Date Copy check-in, check-out, and notes rstRes!CheckInDate = Me.CheckInDate rstRes!CheckOutDate = Me.CheckOutDate rstRes!Notes = Me.Notes Copy daily and weekly rates rstRes!DailyRate = curDaily rstRes!WeeklyRate = curWeekly Calculate the total charge rstRes!TotalCharge = ((Int(Me.CheckOutDate - Me.CheckInDate) \ 7) * _ curWeekly) + _ ((Int(Me.CheckOutDate - Me.CheckInDate) Mod 7) * _ curDaily) Save the Reservation Row rstRes.Update Commit the transaction CommitTrans intTrans = False Clean up rstRes.Close Set rstRes = Nothing Set db = Nothing Requery this form to remove the booked row Me.Requery Return success Bookit = True BookIt_Exit: Exit Function BookIt_Err: MsgBox "Unexpected Error: " & Err & ", " & Error, vbCritical, gstrAppTitle ErrorLog Me.Name & "_Bookit", Err, Error Bookit = False If (intTrans = True) Then Rollback Resume BookIt_Exit End Function

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A control flow extension for asynchronous wide-area concurrency (formerly known as Polyphonic C#) A data type extension for XML and database manipulation (formerly known as Xen and as X#)

It makes sense to have the actual booking code back in the frmUnbookedRequests form because the row the code needs to insert into tblReservations needs several fields from the 916

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