Answer Posted / aparna murthy

overloading is the ability to define several methods with
the same name ,provided each method has a different signature.

example:--

class shape
{
public void area(double r)
{
console.writeline("Area of circle :"+(3.14*r*r));
}
public void area(double l,double b)
{
console.writeline("Area of rectangle :"+(l*b));
}
public void area(int b,int h)
{
console.writeline("Area of rectangle :"+(0.5*b*h));
}
}
class program
{
static void main(string[]args)
{
shape s=new shape()
s.area(7,6)
s.area(22,11);
s.area(12,20);
console.read();
}
}

try this example.....

signature of a method is the datatype of the
parameters,number of parameters and the sequence in which
they are passed to the function .

overriding:---
In method overriding method have same names same signatures
same return types but in different scopes(classes) in
hierarchy .c# uses virtual and override keywords to define
method overriding .Method overriding enables object to
resolve method invocation at runtime.we call it late binding
behavior of object.
1.An override declaration cannot change the accesibility of
vitual method .Both the override method and the virtual
method must have the same access level modifier.
2.Methods which are to be overriden in the subsequent
derived class are made virtual or abstract in base class.

example:--

class employee
{
public virtual double calculatesalary()
{
return basic+hra+da;
}
}
class manager:employee
{
public override double calculatesalary()
{
return basic+hra+da+allowances;
}
}
static void main(string[] args)
{
employee mgr=new manager();
double salary=mgr.calculatesalary();
console.writeline(salary);
console.readline();

}

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