LINQ in practice

Now we can build a console app to explore practical examples of using LINQ.

Understanding deferred execution

LINQ uses deferred execution. It is important to understand that calling most of the above extension methods does not execute the query and get the results. Most of these extension methods return a LINQ expression that represents a question, not an answer. Let's explore:

1. Use your preferred code editor to create a new project, as defined in the following list:
   • Project template: Console App / console
   • Project file and folder: LinqWithObjects
   • Solution file and folder: Chapter11
2. In the project file, globally and statically import the System.Console class.
3. Add a new class file named Program.Helpers.cs.
4. In Program.Helpers.cs, delete any existing statements and then define a partial Program class with a method to output a section title, as shown in the following code:

partial class Program
{
  private static void SectionTitle(string title)
  {
    ConsoleColor...