Answer / sandeep negi

//Consider IShape interface like this

interface IShape
{string CalculateArea();}

class Circle : IShape
{
public string CalculateArea(){return "Circle area";}
}

class Rectangle : IShape
{
public string CalculateArea(){return "Rectangle
area";}
}


//implement function
private string ProcessArea(IShape shape)
{return shape.CalculateArea();}

//call this function from main or from button click event
like this

private void button1_Click(object sender, EventArgs e)
{
Rectangle r = new Rectangle();
Circle c = new Circle();
MessageBox.Show(ProcessArea(r));
MessageBox.Show(ProcessArea(c));
}

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