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I wanted the examples in the previous chapter to be easy for someone trying to learn how to query with the LINQ to DataSet API I wanted the time you spend working with any examples to be focused on LINQ I didn t want you to have to struggle with getting a database or getting your connection string correct But, before we leave this chapter, I want to provide a more complete example one that is actually getting a DataSet from a database because this is most likely how you will obtain a DataSet in your real-life code I must admit that creating a reasonable-size example that gets data from a database and uses the LINQ to DataSet API to any degree feels very contrived After all, I am going to perform a SQL query on data in a database using ADO.

In addition to the DataRow-specific comparer class for the set-type operators, there is a need for some DataRow-specific operators. These operators are defined in the System.Data.DataSetExtensions.dll assembly, in the static System.Data.DataRowExtensions class. You have no doubt noticed that in virtually every example thus far, we have used the Field<T> operator to extract a DataColumn object s value from a DataRow. There are two purposes for this operator: correct equality comparisons and null value handling. With DataRow objects, we have a problem. Their DataColumn values do not get compared properly for equality when they are accessed with the DataRow object s indexer if the column is a value-type. The reason is that because the column s data type could be any type, the indexer returns an object of type System.Object. This allows the indexer to return an integer, a string, or whatever data type is necessary for that column. This means that if a column is of type int, it is a value-type, and it must get packaged into an object of type Object. This packaging is known in the Microsoft .NET Framework as boxing. Pulling the value-type back out of the object is known as unboxing. This boxing is where the problem lies. Let s take a look at some sample code. First, let s take the example of comparing an integer literal to another integer literal of the same value, as shown in Listing 10-7.

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NET to obtain a DataSet, then turn right around and query that data again using LINQ to DataSet, all within several lines of code In real life, some would ask, why not just change the SQL query to get exactly what you need in the first place To them I say, play along! What I need here is a scenario to explain away the silliness In my scenario, I work for a company named Northwind If ever there was a less than subtle hint at the database I will be using, that was it My company has an already existing application that queries our database for orders This particular application performs various analyses on which employees sold items to which customers, and to what countries the orders were shipped So the application is already downloading the employees, customers, and shipping countries for all orders into a DataSet.

Console.WriteLine("(3 == 3) is {0}.", (3 == 3)); The following is the result of this code: (3 == 3) is True.

There is absolutely no surprise there. But what happens when an integer gets boxed Let s examine the code in Listing 10-8 and look at the results.

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