What is Constructor?

Constructor is used to initializing the Class and Private members within the class. 

It is like a method but with no return type like void or int or any. Constructors are the first being called.

For example,

Class Car
{
        private string color; //Private field member

        public Car(string _color)    //Constructor initialization
        {
                color = _color;
        }

}

//Initializing Class

Car myCar = new Car("Red"); // This will call the constructor 

Basic things to remember,

• It must match the class name
• No return type is allowed
  
• No separate method call required, as above example at class initialization it is called directly
• All classes have their own default constructors if it is not declared.
• Constructors can have multiple parameters and such is called Parameterized Constructors
• Constructors can be overloaded by using different parameters (Will see more on Overloading and Overriding in upcoming posts)

Types of Constructors

• Parameterless Constructor / Default Constructor
• If no constructor is defined C# create for itself
• Parameterized Constructor
• Constructor with parameters one or many is called parameterized constructor
• Used to initialize the members of the class
• Static Constructor
• Static constructor used to initialize the static members
• You can have Public and Static constructor
• Private Constructor
• If a class has a Private Constructor only, other classes will not be able to create an instance of that class