C# Example: creating a class, defining properties and methods, instantiating objects, and accessing their members

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 using System;

class Program
{
    static void Main(string[] args)
    {
        Person person1 = new Person("John", 30);
        Person person2 = new Person("Jane", 25);

        person1.SayHello();
        person2.SayHello();

        Console.WriteLine(person1.Name + " is " + person1.Age + " years old.");
        Console.WriteLine(person2.Name + " is " + person2.Age + " years old.");
    }
}

class Person
{
    public string Name { get; set; }
    public int Age { get; set; }

    public Person(string name, int age)
    {
        Name = name;
        Age = age;
    }

    public void SayHello()
    {
        Console.WriteLine("Hello, my name is " + Name + "!");
    }
}

This example defines a Person class with Name and Age properties and a SayHello() method, creates two Person objects, and accesses their members. The following steps are performed:

Define a Person class with Name and Age properties and a SayHello() method.
Create two Person objects using the new keyword and passing in the name and age as arguments to the constructor.
Call the SayHello() method on both Person objects to output a greeting to the console.
Access the Name and Age properties of both Person objects and output them to the console using Console.WriteLine().

Note that there are many other class-related concepts and operations you can perform, such as inheritance, interfaces, and encapsulation. This example is just one possible multi-step process for working with classes.