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Class in C#, Create new object of C# Class, Add Property, Methods, C# a object type

C# class and object example

C# Class and Object concept with examples.

c# class and object, property, methods

In this Article we learn about Class, object, property, methods in C# .Net.
A class is a type of blueprint of any business object, that define a particular entity of any business with all attributes and functionalities.
Let's look at some Examples.

C# Class Example

Here we are working for a online training company called "WebTrainingRoom", we are into training business, here you can see i have created a class called Training, that contains all training related properties, methods etc.

namespace WebTrainingRoom
{
    public class Training
    {
        public Training()
        {
            
        }
        public string Subject { get; set; }
        public string Location { get; set; }
        public string Trainer { get; set; }
            
        public void Schedule()
        {
            
        }
        public void SendInvoice ()
        {
        }
    }
}

Please look at the picture below

c# class example

What is Object in C#?

Object is an instance of a class, let’s see an example.

Right now we have created Training class, now I as a student want to send a training request, in system we have another class called Student. So, from Student class we create a new instance of class Training, here is how..

public class Student
{
public void RequestTraining()
{
Training _training = new Training();         
    _training.Location = "Nariman Point, Mumbai";
    _training.Subject = "Asp.Net, C#, SQL";
            
    _training.Schedule();            
    _training = null;
    }
}

When a new object is instantiated with new keyword , it is allocated with a block of memory location on heap (because class is reference type). Object is also a keyword in C# (System.Object).

Here are few things to learn from c# object example:

  • c# object declaration
    Student s=new Student();
    
  • C# object type
    Student s=new Student();
    Type t= s.GetType();
    
  • c# object dispose
    Student s=new Student();
    s.Dispose();
    s =null;
    
    Learn how to implement IDisposable Interface

C# object Constructor Example

We can have multiple constructors in a class, also known as constructor overload

public Training()         
{
          
}
            
public Training(string TrainingName)
{
}

C# object Property Example

We can have any number of properties with any type of access modifier

public  class Student
{
    public string Subject { get; set; }             
    private string Location { get; set; }             
    public DateTime TrainingDate { get; set; }             
    protected string Trainer { get; set; }
}


// example how to access property
Student s=new Student();
s.Subject="C# Object Property";

C# object Methods Example

We can have any number of methods with any type of access modifier and return type

public class Training 
{
    public void Schedule()
    {   
        
    }
           
    protected void SendInvoice()
    {

    }
}

// example how to access method
Training tr=new Training()
tr.Schedule();

C# Namespace Example

Namespace is basically logical boundary name of any assembly, or scope of class, in .NET Framework namespaces are used for organizing many classes under it

namespace WebTrainingRoom             
{ 
    public  class Student
    {
    }
}

So when we use our Training class from another class, we have specify the namespace like using WebTrainingRoom;

Another example, suppose we want to use List class (ex. List<string> _Colors = new List<string>();), then we need to have reference of Generic namespace like using System.Collections.Generic; in our program

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