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The function begins by setting an error trap that executes the code at the ProcErr label if anything goes wrong. You might remember from the previous chapter that you can open a form that has code behind it by setting an object to a new instance of the form s class module. This is exactly what this function does to get the form open. In addition, it calls the Property Set procedure for the form s ctlToUpdate property to pass it the control object that should be updated after the user picks a date value. The function also passes along an optional variable to indicate whether the control needs a date and time or a date only (intDateOnly). Once the calendar form is open and has the control it needs to update, this function is finished. Notice that the object variable used to open the form is declared in this module s Declarations section. It cannot be declared inside the function because the variable would go out of scope (and the form would close) when the GetDateOCX function exits. The final pieces of code that make this all work are in the module behind the frmCalendarOCX form. You see the portion of the code that initializes the form listed below.

Option Compare Database Option Explicit This form demonstrates both using a custom control (MSCal.OCX) and manipulating a Class via Property Set

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Remote access, which is available with Windows Server with the Routing and Remote Access service, allows remote access clients to connect to remote access servers and access

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Be aware that the order of the source and destination objects is important in LINQ join clauses. Unlike the forgiving nature of SQL interpreted by the database, LINQ is less forgiving. Because the query expressions are translated to methods, changing the order of the tables but not the fields will result in a compile time error. Here is the definition for the System.Enumerable.Linq.Join extension method:

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public static IEnumerable<TResult> Join<TOuter, TInner, TKey, TResult> (this IEnumerable<TOuter> outer, IEnumerable<TInner> inner, Func<TOuter, TKey> outerKeySelector, Func<TInner, TKey> innerKeySelector, Func<TOuter, TInner, TResult> resultSelector)

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When you switch to Datasheet view, you can see the calculated amount from your expression as shown in Figure 7-17.

Note that not all the calculated amounts are larger than the amount already stored in the record. When the reservation is for six days or fewer, the daily rate applies, so your calculation should match the existing charge. You might want to display only the records where the new calculated amount is different than the amount already stored. For that, you can add another expression to calculate the difference and then select the row if the difference is not zero. Switch back to design view and enter a new expression to calculate the difference in an empty column. Your expression should look like:

TotalCharge - (([CheckOutDate] - [CheckInDate]) * [DailyRate])

Notice how the first and third parameters match up, as do the second and fourth. Figure 6.5 shows how the Join in our query maps to the parameters of the extension method. We can see how the outer and outerKeySelector parameters match up. If we were to transpose the outer and inner parameters or the corresponding innerKeySelector and outerKeySelector, we d end up with a mismatch on our parameters when translating them to the underlying extension method.

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In the Criteria line under this new field, enter <> 0. Your query design should look like Figure 7-18, and the datasheet for the query now displays only the rows where the calculation result is different, as shown in Figure 7-19.

Figure 7-19. The datasheet now shows only the rows where the calculation is different than the stored value.

You might have inferred from the earlier discussion about entering criteria that you can only use constant values in the Criteria or Or line. As you can see, you can also compare the value of one field or expression with another field or expression containing a reference to a field.

So far each of these joins has been a cross join (or inner join), where we only return the values that have similar results in both tables. But often, we want to return results from one table regardless of whether there are matching results in the other table. In standard SQL terms, this is typically referred to as an outer join. In the previous example, we may want to get a listing of all of the subjects regardless of whether any books are actually in our database for that subject. This would typically be expressed with the following ANSI-92 SQL expression:

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