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... public static int Sum(this IEnumerable<int> source) { if (source == null) throw new ArgumentNullException("source"); int sum = 0; checked { foreach (int v in source) sum += v; } return sum; } public static int Sum(this IEnumerable<int > source) { if (source == null) throw new ArgumentNullException("source"); int sum = 0; checked { foreach (int v in source) if (v != null) sum += v; } return sum; } public static int Sum<T>(this IEnumerable<T> source, Func<T, int> selector) { return Enumerable.Sum(Enumerable.Select(source, selector)); } public static int Sum<T>(this IEnumerable<T> source, Func<T, int > selector) { return Enumerable.Sum(Enumerable.Select(source, selector)); } ... } }

You must click the New button again to define the second part of the join If you re using drag and drop, you can do this with only one field at a time even though you can select multiple fields in either table window In this example, you want to add to the query the FacilityID and FacilityName fields from the tblFacilities table and the ReservationID, EmployeeNumber, FacilityID, RoomNumber, CheckInDate, and CheckOutDate fields from the tblReservations table (I resized the columns in the query grid in Figure 8-1 so you can see almost all the fields).

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Why you should always pick the primary key in the Table Wizard The wizard might pick the wrong field as the primary key, particularly when you re using the Table Wizard to define a table that contains both an identifier field for the table as well as fields that you ll use to link to other tables. For example, if you build an Employees table and include both the EmployeeNumber field (that you intend to use as the primary key) and the DepartmentID field (to link later to a Departments table), the wizard incorrectly picks DepartmentID as the primary key of the table. It seems to prefer fields that end in ID over ones that end in Number.

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As you can see in the code, the Sum operator is implemented as four method overloads. These methods can be easily adapted to create the LongSum operator. Listing 12.2 shows the source code that implements the same four methods but with longs as the results.

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Click the Next button to see the window shown in Figure 4-16. In this window, you can specify a name for your new table. (Because you started by choosing fields from the Contacts sample table, the wizard suggests that you name the table Contacts, which is just fine.) You can also ask the wizard to set a primary key for you, or you can define your own primary key. In many cases, the wizard chooses the most logical field or fields to be the primary key, but you can ensure that it picks the right one by specifying that you want to select it (No, I ll set the primary key). If the wizard can t find an appropriate field to be the primary key, it creates a new primary key field that uses a special data type called AutoNumber. As you ll learn later in this chapter, the AutoNumber data type ensures that each new row in your table will have a unique value as its primary key.

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Listing 12.2 LongSum, improved implementation of the Sum operator for int (SumExtensions.cs)

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Figure 4-16.

Go ahead and choose the option to pick your own primary key and then click Next. The Table Wizard displays the window shown in Figure 4-17. You can open the list at the top of the window to select any field that you defined. This is a Contacts table, so ContactID is the appropriate field to choose. If you choose the first option for the type of key, the wizard uses an AutoNumber data type that I ve already mentioned. The second option causes the wizard to create a number field into which you must enter a number for each record, and the third option gives you a text field for each record. In this case, pick the first option.

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