Volume of Cylinder

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace WindowsFormsApplication1

{

    public partial class VolumeSphere : Form

    {

        public VolumeSphere()

        {

            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            double a = Convert.ToDouble(textBox1.Text);

            double b = Convert.ToDouble(textBox2.Text);

            double c = 3.14*a *a* b;

            textBox3.Text = c.ToString();

        }

    }

}