Operadores

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 WindowsFormsApp4
{
    public partial class Form1 : Form
    {
        float S;
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            float operadorA = Convert.ToSingle(textBox1.Text);
            float operadorB = Convert.ToSingle(textBox2.Text);
            S = operadorA + operadorB;
            label1.Text = Convert.ToString(S);
            button1.Text = "Sumar";
        }

        private void button2_Click(object sender, EventArgs e)
        {
            float operadorA = Convert.ToSingle(textBox1.Text);
            float operadorB = Convert.ToSingle(textBox2.Text);
            S = operadorA - operadorB;
            label1.Text = Convert.ToString(S);
            button2.Text = "Restar";
        }

        private void button3_Click(object sender, EventArgs e)
        {
            float operadorA = Convert.ToSingle(textBox1.Text);
            float operadorB = Convert.ToSingle(textBox2.Text);
            S = operadorA * operadorB;
            label1.Text = Convert.ToString(S);
            button3.Text = "Multiplicar";
        }

        private void button4_Click(object sender, EventArgs e)
        {
            float operadorA = Convert.ToSingle(textBox1.Text);
            float operadorB = Convert.ToSingle(textBox2.Text);
            S = operadorA / operadorB;
            label1.Text = Convert.ToString(S);
            button4.Text = "Dividir";
        }
        }
    }