Method Hiding and Use of Virtual Keyword in C#.NET

1) Method Hiding

class Base

{

public Base() { Console.Write("Base constructor \n");}

public void show() {Console.Write("Base Show \n");}

}

class Child : Base

{

public Child() { Console.Write("Child constructor \n");}

public void show() {Console.Write("Child Show \n");}

// It will give you the compilation Warning

// Put NEW keyword for Intentionally "Method Hiding" No Warning will come

// public new void show() {Console.Write("Child Show \n");}

}

class Class1

{

static void Main(string[] args)

{

Base b1 = new Base();

b1.show(); // 1) Base constructor 2) Base Show

Child c1 = new Child();

c1.show(); // 1) Base constructor 2) Child constructor 3) Child Show

Base b11 = new Child();

b11.show(); // 1) Base constructor 2) Child constructor 3) Base Show

//Child c11 = new Base();

// give compilation Error Can't explict conversion

//Child c11 = (Child) new Base();

// if you do explicit type conversion then run time error say "Invalid Conversion"

//c11.show();

Console.ReadLine();

}

}

1) Virtual Keyword

class Base

{

public Base() { Console.Write("Base constructor \n");}

public virtual void show() {Console.Write("Base Show \n");}

}

class Child : Base

{

public Child() { Console.Write("Child constructor \n");}

public override void show() {Console.Write("Child Show \n");}

}

class Class1

{

static void Main(string[] args)

{

Base b1 = new Base();

b1.show(); // 1) Base constructor 2) Base Show

Child c1 = new Child();

c1.show(); // 1) Base constructor 2) Child constructor 3) Child Show

Base b11 = new Child();

b11.show(); // 1) Base constructor 2) Child constructor 3) Child Show

//Child c11 = new Base();

// give compilation Error Can't explict conversion

//Child c11 = (Child) new Base();

// if you do explicit type conversion then run time error say "Invalid Conversion"

//c11.show();

Console.ReadLine();

}

}

Ritesh Kumar Kesharwani

A D I T I , B A N G A L O R E

Software Professional

---

Relax. Yahoo! Mail virus scanning helps detect nasty viruses!