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StudentClass[] classDesignations = { new StudentClass { Id = 1, Class = "Sophmore" }, new StudentClass { Id = 7, Class = "Freshman" }, new StudentClass { Id = 13, Class = "Graduate" }, new StudentClass { Id = 72, Class = "Senior" } }; DataTable dt1 = GetDataTable(students); IEnumerable<DataRow> seq1 = dt1.AsEnumerable(); DataTable dt2 = GetDataTable2(classDesignations); IEnumerable<DataRow> seq2 = dt2.AsEnumerable(); string anthonysClass = (from s in seq1 where s.Field<string>("Name") == "Anthony Adams" from c in seq2 where (int)c["Id"] == (int)s["Id"] select (string)c["Class"]). SingleOrDefault<string>(); Console.WriteLine("Anthony's Class is: {0}", anthonysClass != null anthonysClass : "null"); If you run that code, you will get this result:

Anthony's Class is: Freshman So that solves the boxing problem. However, there is still one other problem. When you attempt to retrieve a column s value using the DataRow object s indexer, remember, the column s value gets returned as an object of type Object. So to compare it to any value or assign it to a variable will require casting it to another data type as I did previously by casting it to an int. Since DataSet objects use DBNull.Value as the value for a column that is null, if that column s value is DBNull.Value, casting it to another data type will throw an exception. Fortunately, LINQ to DataSet has made both of these problems boxed value comparisons and null handling disappear, thanks to the Field<T> and SetField<T> operators. Listing 10-11 shows the previous example using the Field<T> operator. Listing 10-11. Using the Field Operator Student[] students new Student { Id new Student { Id new Student { Id new Student { Id }; = = = = = { 1, Name = "Joe Rattz" }, 7, Name = "Anthony Adams" }, 13, Name = "Stacy Sinclair" }, 72, Name = "Dignan Stephens" }

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Thus, with Spring Security, a few lines of configuration are enough to set up your authentication component. Once the user is successfully authenticated, the request is forwarded to the URL specified by the defaultTargetURL, which in this case is /secure/app/ createPolicy.do. Anonymous Processing Filter (ANPF) This is the third filter in the chain. Its sole purpose is to set an anonymous Authentication object in the security context. This will allow you to browse certain URLs that are not

StudentClass[] classDesignations = { new StudentClass { Id = 1, Class = "Sophmore" }, new StudentClass { Id = 7, Class = "Freshman" }, new StudentClass { Id = 13, Class = "Graduate" }, new StudentClass { Id = 72, Class = "Senior" } };

On the Features tab of the Properties dialog box, you can configure specific features for your auto attendant, as shown in Figure 7-7. Most of the features are self-explanatory based on their names. One that may not be obvious is the Matched Name Selection Method option. This option determines how a user can find a user. You can inherit from the dial plan or select a different field, such as department, title, last name, or first name.

DataTable dt1 = GetDataTable(students); IEnumerable<DataRow> seq1 = dt1.AsEnumerable(); DataTable dt2 = GetDataTable2(classDesignations); IEnumerable<DataRow> seq2 = dt2.AsEnumerable(); string anthonysClass = (from s in seq1 where s.Field<string>("Name") == "Anthony Adams" from c in seq2 where c.Field<int>("Id") == s.Field<int>("Id") select (string)c["Class"]). SingleOrDefault<string>(); Console.WriteLine("Anthony's Class is: {0}", anthonysClass != null anthonysClass : "null"); This code is the same as the previous example except I call the Field<T> operator instead of casting the field as an int. Here are the results:

secure and can be viewed without verifying user s identity with the application. ANPF can be configured as shown in Listing 6-13.

As I just demonstrated in Listing 10-11, the Field<T> operator allows you to obtain the value of a column from a DataRow object and handles the casting of DBNull.Value and boxed value comparison problems I previously discussed.

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