Eleventh Class

Eleventh Class (constructor and Destructor)

constructor and destructor in c sharp

constructor :
1. Same name as class name.
2. Constructor call automatically in Main().
3. No return type use to declare constructor.

Example of constructor


using System;

class car
{
car()
{
Console.WriteLine("Constructor Invoked");
}
public static void Main()
{
car c=new car();
}
}


Here car() is constructor and dont need to access it through object.

Two type of Constructor 


1. Instance constructor
2. Static constructor

1. Instance Constructor

Instance variable is use to instance data member of a class.
N number of constructor can be declare in a class.

Example of Instance Constructor



using System;
class car
{
int a, b, c;

car()
{
a=2;b=3;
c=a+b;
Console.WriteLine("Result is :"+c);
}
public static void Main()
{
car c = new car();
}
}

                                                 Example 2



using System;
class car
{
int a, b, c;
car()

{
a=2;b=3;
c=a+b;
Console.WriteLine("Result is :"+c);
}
public void color()
{
Console.WriteLine("hi this is red color");
}
public static void Main()
{
car c = new car();
c.color();
}
}


2. static constructor


static constructor is use to initialize the static variable of a class.



using System;

class cons
{
cons()
{
Console.WriteLine("this is first constructor");
}
static cons() //static constructor run at first...
{
Console.WriteLine("this is second constructor");
}
public static void Main()
{
cons c=new cons();
}
}