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To use the LINQ to DataSet operators, add a using directive to the top of your code for the System.Linq and System.Data namespaces if they are not already there: using System.Data; using System.Linq; This will allow your code to find the LINQ to DataSet operators.

DataTable dt1 = GetDataTable(students); IEnumerable<DataRow> seq1 = dt1.AsEnumerable(); string name = seq1.Where(student => student.Field<int>("Id") == 7) .Select(student => student.Field<string>("Name")) .Single(); Console.WriteLine("Student's name is '{0}'", name); OK, this is the same code except I use the Field<T> operator instead of casting it to a string. Let s look at the results:

Virtually every example in this chapter will use a DataTable object on which to perform LINQ to DataSet queries. In production code, you would typically obtain these DataTable objects by querying a database. However, for some of these examples, we present situations where the data conditions in a typical database table will not suffice. For example, we need duplicate records to demonstrate the Distinct method. Rather than jump through hoops trying to manipulate the database to contain the data we may need, we programmatically create a DataTable containing the specific data we need for each example. This also relieves you of the burden of having a database for testing the majority of these examples. Since we will not actually be querying a database for the DataTable objects (and to make creating the DataTable objects easy), we generate them from an array of objects of a predefined class. For the predefined class, we use the Student class.

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When a user interacts with the deck component (for example, expanding an item), a request is sent to the server with information about the action performed. By now you know that the first phase, Restore View, will restore the component hierarchy on postback. The second phase is the interesting phase the Apply Request Values phase (see Figure 3-6).

class Student { public int Id; public string Name; } You should just imagine that we are querying a table named Students where each record is a student, and the table contains two columns: Id and Name.

Just as with the retrieval of DataColumn objects, null adversely affects the setting of DataColumn objects. To assist with this issue, the SetField<T> operator was created. It handles the case where a DataColumn object s value is set with a nullable data type whose value is null.

To make creating the DataTable simple and to prevent obscuring the relevant details of each example, we use a common method to convert an array of Student objects into a DataTable object. This allows the data to easily vary from example to example. Here is that common method:

The SetField<T> operator has three prototypes I cover. The first prototype allows you to set a column s current value for the DataColumn specified. The First SetField Prototype public static void SetField ( this DataRow first, System.Data.DataColumn column, T value); The second prototype allows you to set a column s current value for the column with the specified name. The Second SetField Prototype public static void SetField ( this DataRow first, string columnName, T value); The third prototype allows you to set a column s current value for the column with the specified ordinal. The Third SetField Prototype public static void SetField ( this DataRow first, int ordinal, T value);

static DataTable GetDataTable(Student[] students) { DataTable table = new DataTable(); table.Columns.Add("Id", typeof(Int32)); table.Columns.Add("Name", typeof(string)); foreach (Student student in students) { table.Rows.Add(student.Id, student.Name); } return (table); } There isn t anything complex in this method. We just instantiate a DataTable object, add two columns, and add a row for each element in the passed students array. For many of the examples of the LINQ to DataSet operators, we need to display a DataTable for the results of the code to be clear. Although the data in the DataTable varies, the code needed to display the DataTable object s header will not. Instead of repeating this code throughout all the examples, we create the following method and call it in any example needing to display a DataTable header:

1 execute()

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