private void bCalculate_Click(object sender, EventArgs e) { if (cbChoose.Text == "Circle") { lbAnswer.Items.Clear(); _radius = Convert.ToInt32(tbRadius.Text); Circle circle = new Circle() { Radius = _radius }; lbAnswer.Items.Add("Circle Area with radius " + _radius + " is: " + circle.CalculateArea()); lbAnswer.Items.Add("Circle circumference with radius " + _radius + " is: " + circle.CalculateCircumference()); } else if (cbChoose.Text == "Square") { lbAnswer.Items.Clear(); _side = Convert.ToInt32(tbSide.Text); Square square = new Square() { Side = _side }; lbAnswer.Items.Add("Square Area with radius " + _side + " is: " + square.CalculateArea()); lbAnswer.Items.Add("Square circumference with radius " + _side + " is: " + square.CalculateCircumference()); } else if (cbChoose.Text == "Rectangle") { lbAnswer.Items.Clear(); _height = Convert.ToInt32(tbHeight.Text); _width = Convert.ToInt32(tbWidth.Text); RectangleShape rectangleShape = new RectangleShape() { Height = _height, Width = _width }; lbAnswer.Items.Add("Rectangle Area with radius is: " + rectangleShape.CalculateArea()); lbAnswer.Items.Add("Rectangle circumference with radius is: " + rectangleShape.CalculateCircumference()); } else if (cbChoose.Text == "Right Angle Triangle") { lbAnswer.Items.Clear(); _height = Convert.ToInt32(tbHeight.Text); _length = Convert.ToInt32(tbLength.Text); RightAngleTriangle rightAngleTriangle = new RightAngleTriangle() { Height = _height, Length = _length }; lbAnswer.Items.Add("Right Angle Triangle area with radius is: " + rightAngleTriangle.CalculateArea()); lbAnswer.Items.Add("Right Angle Triangle circumference with radius is: " + rightAngleTriangle.CalculateCircumference()); } else { lbAnswer.Items.Clear(); _length = Convert.ToInt32(tbLength.Text); TriangleShape triangleShape = new TriangleShape() { Length = _length }; lbAnswer.Items.Add("Triangle area with radius is: " + triangleShape.CalculateArea()); lbAnswer.Items.Add("Triangle circumference with radius is: " + triangleShape.CalculateCircumference()); } }