C# Grammar and Features

C# is a general-purpose programming language that was developed by Microsoft in 2002. C# is a compiled language, which means that it is converted into machine code before it is executed. This makes C# a very efficient language, and it is often used to write high-performance applications.

C# is a statically typed language, which means that the types of variables and expressions must be known at compile time. This helps to prevent errors and makes the code more readable and maintainable.

C# has a number of advanced features that make it a powerful language. These features include:

• Classes and objects: C# supports object-oriented programming, which is a programming paradigm that uses classes and objects to represent data and behavior.
• Generics: C# supports generics, which is a feature that allows you to create code that can work with any type of data.
• Lambda expressions: C# supports lambda expressions, which are anonymous functions that can be used to create short, concise code.
• LINQ: C# supports LINQ, which is a library of methods that allow you to query data in a declarative way.
• Asynchronous programming: C# supports asynchronous programming, which is a way of writing code that can run in parallel with other code.

Examples

Here are some examples of C# code that demonstrates the use of the above features:

// This is a class that represents a person.
public class Person {
  public string Name { get; set; }
  public int Age { get; set; }
}

// This is a method that calculates the sum of two numbers.
public static int Sum(int a, int b) {
  return a + b;
}

// This is a lambda expression that prints the name and age of a person.
var printPerson = (person) => {
  Console.WriteLine("Name: {0}", person.Name);
  Console.WriteLine("Age: {0}", person.Age);
};

// This is a LINQ query that selects all people who are over the age of 18.
var adults = from person in people
              where person.Age >= 18
              select person;

// This is an asynchronous method that prints the names of all people in a list.
async Task PrintNames(List<Person> people) {
  foreach (var person in people) {
    await Task.Delay(1000);
    Console.WriteLine(person.Name);
  }
}

This is just a small example of the many things that can be done with C#. For more information, please consult a C# programming tutorial or reference manual.