This document discusses several key concepts in object-oriented programming using C# including classes, objects, properties, methods, constructors, and delegates. It provides examples of defining a Product class with properties like name and price, adding methods like GetHtml(), creating Product objects, and using a delegate to detect when an object's price property changes.

1. AgendaClasses

2. Objects

3. Adding Properties & Methods to a class

4. Constructors

5. Using Delegates

6. Create a Project Using Class ClassesClasses are code definitions or blueprints for its instances or simply objectspublic class Product{private string name;private decimal price;private string imageUrl;public string Name { get; set; }public decimal Price { get; set; }public string ImageUrl { get; set; }}

7. Adding Properties to the Classpublic string Name{get{return name;}set{name = value;}}public decimal Price{get{return price;}set{price = value;}}public string ImageUrl{get{return imageUrl;}set{imageUrl = value;}

8. Adding ConstructorA constructor is a method that automatically runs when a class object is first created. In C#, the constructor always has the same name as the name of the class. Unlike a normal method, the constructor doesn’t define any return type, not even void. public class Product{// (Additional class code omitted for clarity.)public Product(string name, decimal price){Name = name;Price = price;}public Product(string name, decimal price, string imageUrl){Name = name;Price = price;ImageUrl = imageUrl;}}

9. Adding a Methodpublic class Product{// (Additional class code omitted for clarity.)public string GetHtml(){string htmlString;htmlString = "<h1>" + name + "</h1><br />";htmlString += "<h3>Costs: " + Price.ToString() + "</h3><br />";htmlString += "<imgsrc='" + imageUrl + "' />";return htmlString;}}

10. Creating ObjectsObjects are the instance of a class. They can be created by typing a keyword new, which means it grabs on to a piece of memory and creates the object there.Product saleProduct = new Product();// Optionally you could do this in two steps:// Product saleProduct;// saleProduct = new Product();saleProduct.Name = "Kitchen Garbage";saleProduct.Price = 49.99M;saleProduct.ImageUrl = "http://mysite/garbage.png";